Forgot to say something about this.

Yes. I do. I think that because you can't beat Herc in a one on one.

Arondight's a shit NP. It's stat boosts. Stats don't matter as much as everyone thinks, and if you're making him use Arondight it seals his only good NP, but whatever, let's go with Arondight.

Lancelot dies to Cu in straight combat. Cu has AoG runes to back him up, and is faster than Lancelot because his speed stat is the highest out of all Servants. He doesn't have to deal with Invisible Air + Instinct like he did against Altria, and is able to go all out, and Lancy's MR is shit so rune buffing makes it a two-front war.

Medea it's not a contest. Lancelot doesn't have ranged capability with Arondight active, he's forced to try and get in her range. Oh, and there's a distinct problem with that, Medea can casually Atlas him, or OHKO him with spells when he goes to attack her. Medea casts High Thaumaturgy at the same speed Lancy swings a sword, she's a monster who's crippled by the existence of MR, and guess what Lancy doesn't have a lot of? She could solo most of the DAAs with ease, she can manipulate time, create alien worlds, casually stop mountain-busting attacks, telefrag people with Tropha, etc. She loses because of jobbing and because MR exists. If you give her Not!Kojiro, it's even less of a contest. Not!Kojiro holds back Rin!Saber for an extended period of time, and Rin!Saber is better than Arondight!Lancy if you exclude things like emotional states, because Altria has Instinct which is the most hax battle skill in existence, and the only reason she could keep up with Not!Kojiro on his home turf. If Medea doesn't have to worry about getting hit, it's even less of a fight.

Etc, etc.

Now, who can beat Herc in a 1v1?

Altria can't. Excalibur isn't an OHKO for him, as he tanked one of those in HF, so he gains invulnerability to Excalibur, and then maybe she can kill him once by stabbing him before he's immune to her STR too.

Cu can't. He can kill him once by boosting his STR to A. After that, it's hopeless.

If you go down the lines, considering A+ NPs are confirmed to kill him 2-3 times and A++ ones aren't an OHKO, the only people that can beat Herc in a 1v1 are monsters like Gilgamesh and Nursery Rhyme. Even someone with ridiculous compatibility against him like EMIYA, who mind you has better compatibility against him than even someone like Altria does, can't overcome the gap.

Oh yeah, and that's just "can you theoretically kill him if he just stands there for a few hours and doesn't move". You're still fighting Herc.

It's a compatibility game, but it's a game so insanely biased in Herc's favor. Lancelot's an excellent straight combat fighter. Herc's the god of TM attrition. They're incompatible.

Oh yeah, also UBW's shit compared to just normal projection. It's a hindrance for Servants, not a threat. Unless that Servant is named "Irrational, not thinking Gilgamesh". He's better off projecting and BPing weapons. He'll get in more kills and last longer that way.