Okay, this is what I've discovered, based on the signups posted in the signup forum threads:

Visible Signup Raid Experience: Hide
Winter 2015 (January - April)
==============
Tracy - Lead	Binding Coil, GEX, LEX
Dirk Strider	Binding Coil, GEX, TEX, LEX, REX, MEX
Augustus	T1, T2, GEX
Will	Binding Coil, GEX, MEX, LEX
Banjo	-none-
Luis	Binding Coil, GEX, MEX, LEX
Keith	T1, T2
Bolis	T1-T4, GEX, IEX, MEX, LEX
Smashy	T1, T2, T3
Mike	T1, T2
Al	exFFXIV (-none-)
Jay	T1-T8
Brandon	"Some coil", GEX, LEX
Jasper	T1-T4, GEX

Spring 2015 (April - June)
=============
Mat	T1-T7, GEX, TEX, IEX, MEX, LEX
Mike	T1-T3
Luis	T1-T6, GEX, MEX, LEX
Will	T1-T6, GEX, MEX, LEX
Shawn	IEX, GEX, MEX, LEX
Brandon	Binding Coil, GEX, MEX, LEX
Al	T1-T6, GEX, MEX, LEX
Banjo	T1-T6, GEX, MEX
Augustus	T1-T6, GEX, MEX, LEX
Marc	MEX
PAF	Binding Coil, GEX, TEX, IEX, MEX, LEX
Jasper	T1-T6, GEX, MEX, LEX
Keith	T1-T6, GEX, MEX, LEX
Jay	T1-T8, All Extreme Primals (pre 3.0)

Summer 2015 - Heavensward Release (July - September)
============
Shawn	Binding Coil, Second COil, All Extreme Primals (pre 3.0)
Mike	Binding Coil, GEX, LEX, SEX (lol)
Basti	T1-T4
Nico	-none-
Smashy	T1-T4, GEX, LEX, MEX
Mat	T1-T7, All Extreme Primals (pre 3.0)
Luis	T1-T7, GEX, LEX, MEX
Will	T1-T7, GEX, TEX, IEX, LEX, MEX
Joe	T1-T4, GEX, MEX
Banjo	T1-T7, GEX, TEX, IEX, MEX, LEX
Stavros	T1-T11, All Extreme Primals (pre 3.0)
Odinx	-none-
Al	T1-T11, All Extreme Primals (pre 3.0)
Marc	Binding Coil, GEX, LEX
Jay	T1-T7, All Extreme Primals (pre 3.0)

Fall 2015 - Surge in FC Membership (October - December)
===========
Mat	Binding Coil, Second Coil, All Extreme Primals (pre 3.0)
Tyler	GEX, TEX, IEX, MEX, LEX, REX
Shaun	-none-
Matt(Hunter)	Binding Coil, Second COil, All Extreme Primals (pre 3.0)
Aaron	-none-
Mike	T1-T8, All Extreme Primals (pre 3.0)
Dixon	-none-
Mark	"Some coil"
Basti	T1-T10, All Extreme Primals (pre 3.0)
Bullet	Binding Coil, Second COil, All Extreme Primals
Joshua	-none-
Nick	Binding Coil, All Extreme Primals
Marc	T1-T8, All Extreme Primals (pre 3.0)
Blair	-none-
Joey	T1-T11, All Extreme Primals (pre 3.0)
RJ	-none-

For a quick, detailed breakdown:
Raid Experience Breakdown: Hide
Winter 2015 Breakdown
======================
14 Visible Signups
4/14 had completed all of Binding Coil
8/14 had completed Garuda (Extreme)
1/14 had completed Titan (Extreme)
0/14 had completed Ifrit (Extreme)
4/14 had completed Thornmarch (Extreme)
6/14 had completed Leviathan (Extreme)
1/14 had completed Ramuh (Extreme)
0/14 had completed Shiva (Extreme)
1/14 had no prior raid experience

Spring 2015 Breakdown
=======================
14 Visible Signups
11/14 had completed all of Binding Coil
12/14 had completed Garuda (Extreme)
3/14 had completed Titan (Extreme)
3/14 had completed Ifrit (Extreme)
11/14 had completed Thornmarch (Extreme)
11/14 had completed Leviathan (Extreme)
1/14 had completed Ramuh (Extreme)
1/14 had completed Shiva (Extreme)
0/14 had no prior raid experience

Summer 2015 Breakdown
=======================
15 Visible Signups
10/15 had completed all of Binding Coil
3/15 had completed all of Second Coil
5/15 had completed up to Turn 7
12/15 had completed Garuda (Extreme)
7/15 had completed Titan (Extreme)
7/15 had completed Ifrit (Extreme)
10/15 had completed Thornmarch (Extreme)
11/15 had completed Leviathan (Extreme)
5/15 had completed Ramuh (Extreme)
6/15 had completed Shiva (Extreme)
2/15 had no prior raid experience

Fall 2015 Breakdown
=======================
16 Visible Signups
8/16 had completed all of Binding Coil
5/16 had completed all of Second Coil
2/16 had completed up to Turn 8
1/16 had completed up to Turn 10
1/16 had completed up to Turn 11
9/16 had completed Garuda (Extreme)
9/16 had completed Titan (Extreme)
9/16 had completed Ifrit (Extreme)
9/16 had completed Thornmarch (Extreme)
9/16 had completed Leviathan (Extreme)
9/16 had completed Ramuh (Extreme)
8/16 had completed Shiva (Extreme)
2/16 had completed Bismarck (Extreme)
2/16 had completed Ravana (Extreme)
6/16 had no prior raid experience

So we can see an upward trend of experienced players as the seasons pass. This is good. But this also prevents returning raiders because we keep the same structure for teams. And with even more upcoming patches with level 60 content, players are hungry for more.

So here is my proposed structure:

Raid Team Alpha:
Somewhat progression oriented. For those with plentiful raid experience who want to do something that's not Garuda (Extreme) or Turns 1 through 4. This team would be led by a more experienced player, and would go through the Binding Coil, Second Coil, and Final Coil. The use of unsynced parties can be used at the leader's discretion.
If the players are at the appropriate iLvl and job level, this team can also work on the new Heavensward Extreme primals (Bismarck, Ravana).

Raid Team Beta:
Learning Oriented. With the sudden surge of new FC members, there will be many players with no experience that will want to try their hand at raiding. This team will be lead by a patient leader who will guide them through specific Extreme primals, to teach them the basics of raiding. I suggest that these be done without the unsynced parties option, as the higher gear levels will ruin the learning experience. Once the leader feels their team has adequately performed in these trials, they may move on to Binding Coil.
RTB Primals: Hide
Titan - Basic dodging, team cooperation (gaols), tank swaps
Ifrit - Healer mechanics, tank swaps
Leviathan - Raid awareness (jumps, slams)
Ramuh - Tether mechanics, tank swaps
Shiva - Raid awareness, team communication (weapon phases)

Obviously this all depends on player signups, but I am confident that if there is a clear-cut distinction between the goals of the two seasonal teams, there will be more signups. Looking back at the Fall signup scare, many people were worried they didn't have what it took to raid. The recent additions to the FC will feel the same way for this upcoming season. In the same breath, many experienced players will groan at the thought of doing Garuda (Extreme) again for the hundredth time, and will not sign up under the old structure.

If you have any questions or need clarifications please let me know.

Muzzo