That's a shame, I can do a little hex-editing but I don't know the file architecture for summon animations at all so if it needed a complex fix then I'd be a little lost. Cheers for the heads-up, Meesbaker.
By the by, I looked into changing the index for a different animation but as luck would have it the modifier I needed hadn't been identified when this list was made:
Index range increase (PC) increase (PSX) description
000-037 0 0 Player-accessible Magics
038-047, 060-061 [not sure] 4E Summons
048-05F 36 36 E.Skills
062-0FF EC [not sure] Limit Breaks
100~FFF 4E 60 Enemy-exclusive Attacks
Anyone have an idea of what it might be? I'm trying random numbers at the mo but not hit gold yet. I'm beginning to suspect my future has 50+ Quadded Bahamut-ZERO summon animations in it