There's plenty of absorbs over the ideal 12-13 second split, so a group of 3 real people properly spacing absorbs better than I can shouldn't have much of an issue keeping TP under control.
It depends what kind of players you're playing with but in my experience, having a real human behind the KB doesn't guarantee you're going to get absorbs on cooldown, and that's with a regular static (which people assume means perfect players for some reason). In a PUG, I would imagine consistency is not a guarantee, though I've never PUG'd Aminon so IDK.
Either way, as an aside...I don't think 12s on COR is possible (or likely?) as it requires 23% FC on COR/DRK which...might be possible, IDK...I certainly don't have it in my set. 13s is probably possible but again, requires absolute perfect execution and never being in the middle of a WS or other action. I wouldn't expect to see exactly 13s casts from anyone who isn't running a bot. Possibly not even from a bot, since the 13s window might just HAPPEN to run into the exact time when you're in the middle of a WS animation.