Kenyon is worth keeping - he is a quality player, brings intensity, plays the role of the enforcer, and his attitude is not the worst attitude in the league for what he brings. Last year was not so encouraging from an entire year stat or chemistry standpoint, but there were flashes of brilliance even with the bum knee. Everything starts with a flash. I would re-test him before sending him away, unless we're going to get an A.I. in a three-way trade.
The basic standards of showing up and participating in practices, and doing trivial things that even third-tier players do is a must. If Kenyon did all that, I don't think there would be resentment from the other players. With a healthy knee, we'll see.