At least 2 of Young, Hunter, Bentil, or somebody (Mickey and Jackson potentially) will have to go even if you stash Nader. What I think the Celtics may regret is signing Zeller and Green. None of these players mentioned are of high value but there is the potential that the younger players could turn into something down the road. You know Green and Zeller are not going to turn into anything. I remain puzzled by the signing of Green and Zeller. Sure, a couple of veterans will help the team more than the rookies but how much. Signing Zeller tells me they have no confidence in Mickey. Signing Green tells me the same about Hunter and Young. Bentil, Jackson, and Nader are all mid to late 2nd round picks so of course you don't expect much from them.
I know contracts matter but I would cut Hunter (he is the lowest cost of the guaranteed contracts) and I guess let Nader walk if he won't take the D-League pittance. And then you still need to cut Bentil or someone else.