I remember this! They missed one feature of Setzer's Joker-Doom (7-7-Bar): You can have it retarget the enemy if Setzer inputs 77B, gets muddled and demuddled before he executes his action, then when he performs Joker Doom he'll use it on the enemy. It's used in glitch speedruns because it doesn't require you to sacrifice the rest of the party besides Gogo like their Jump example works. You can see it in action at this speedrun right before the final boss.
Reading all of this was pretty interesting! So that whole time when I had all those Gem Boxes and Illumina weapons and my game started acting crazy was because of the sketch glitch, eh? Well, now I know why all that crazy stuff happened to me the first time I played FF6 all those years ago.
It’s amazing just how many glitches that there are in this game, similar to FF7 and it having a ton of glitches too.