I think he needs to remind himself that (according to him) he is still part of the board and therefore would know what is going on in the band and also have some choice on what happens and how it happens.
Can just imagine the board meeting.
"Should we invite KK back into the fold for a few gigs?"
"Yeah"
"Yeah"
"Okay"
"I think we should offer him a heartfelt hand written letter scented with rose water that outlines how much we need him and how special he is. We should also remind him that he is a rock god and the only one worthy of such a position. As remuneration for his services I also believe we should kiss his feet on a daily basis while stroking his manhood and telling him we appreciate him and forever bow at his feet. On top of that he should get paid a lot of money and be the only one to do interviews."
"Thank you for your input KK, motion denied!"