Its nearly common knowledge that in the very last battle in FF7 there is a high-res version of Cloud that can be hacked so it can be used throughout the game. However, the observant gamer would notice that the Sephiroth model in that battle is also a high-res version of Sephiroth, but without his shirt. By merging the high and low res models respectively it would be possible to have a high-res Sephiroth in the very small part of the game you see him in-battle. I'll get around to making this patch in a few days or so, or I'm fine with someone else taking up the idea and doing it. But as far as no one has really experimented with merging models aside from myself.