Hmm... +1 but I'm a bit conflicted of him only staying between JUST the 212th and 501st Battalion, he has no affiliation with either or and him taking operation lead of Umbara was meant to be temporary. I would agree he SHOULD stay in a Battalion but never to be stuck in one; I would like to see him Freelance BUT he must join a Battalion and maybe he can cycle through every clone Battalion like every once a month. So his leadership and commitment is temporary, think of him as a "Substitute" of GAR Jedis like even the Wookieepedia just only says "Galactic Republic - Grand Army of the Republic" so I think he's open interpretation on where (The player) Republic wants him to be at.
Also been talking to a few Jedi's Knight 4+ already, I doubt of him or anyone wanting to play as Pong Krell is going to be out on RDMing (Maybe for a EOT for Rex or someone where he's a potential plot point to be a villain) but he is generally not supposed to be likeable Jedi or the troopers should fear him; I say he is supposed to be reckless and hard to work with if he is going "By the Books". I'd imagine him using formation lines like firing lines mid-fight DESPITE of anyone's wishes (Since who even uses formations nowadays except for ceremonial purposes in Synergy?) like that is something, he can also rudely discipline clones ONLY IC if they expressed enough disobedience, cowardness and insubordination, as well having a lot of distaste against the clones like Rahm Kota and in which I'd be fine with since it's expected of his character to do such a thing. Only a few would survive under his command but despite all of that, he still achieved many victories so regardless he gets the job done it's just never safe for someone to be with him and I think that's the fine line he can be at. I will say this, he shouldn't be regularly purposely killing clones via by impractical plans leading to a lot of casualties which I think he should gain consent to everyone participating on his lead to do such a thing to avoid distain and trust OOC but ONLY to the clones he is leading, anyone else is just up to them how they want to react but that is at the player who is playing Pong Krell at risk of whatever is going to happen next and are expected to know of the consequences that may happen.