[@Mr Allen J] Acknowledged, Savo = scrublord, gotcha.

Maybe if I make it so it only takes 5 minutes to seal an attack or object away for permanent use (instead of automatically releasing itself in like a minute), then make it so injuries always return to their owner after an hour, even if a full five minutes is spent on sealing it? 
 
I'm a bit hesitant to give him too many power-ups, since there're a ton of niche cases where he can totally blank an attack if he can see it coming, and I don't think it's a big issue to have him be weak.  Weak can be fun to write.  My worry is how strong he can be in situations like if Brooke tried her Meteor Impact.  Given he'd have time to open up a container on the way down, he could just bottle it up on impact, then release the whole thing the next second while she's worn out from the attack.  D'you think it'd be okay to raise the number of container's to 12 maybe, or should I just stick to ten and err on the side of caution?  

Also, approximately, how close do you think the sheet is to game-ready?