RBY - Gen 1 misses explained (Partially)

Ok, so here's the Gen 1 accuracy code. (More or less)

AccuracyCheck:
    call BattleRandom     ; Generate a random number 0-255, store it in A
    ld b, a               ; Because we can only do math on A we need to move this into B
    ld a, [MoveAccuracy]  ; Load our move accuracy into A
    sub b                 ; Subtract the random number from A (MoveAccuracy - BattleRandom)
    jr nc, .MoveMiss      ; So, 1 byte can only store 255 maximum, or 0 minimum. So if we go over 255 OR under 0, Carry is On.
                          ; If the Carry flag is OFF then the move misses.

What the above code means is, if we have 100% accuracy (255) and we generate 255 randomly then 255-255 is 0 and the Carry flag stays OFF meaning a 100% accurate move will MISS. So, to fix this we skip the miss check if the result is 0.