If myck is available late first i think that is a no brainer pick.
I would bury fields at the end of the bench and only bring him in as a defensive stopper until he proves he can do anything. I would not empty a roster spot with the expectation he will provide anything. Right now, to me, fields is an expiring contract next year and that is it.
I would probably want one of the remaining centers with the other pick.
I think perkins gets rid of gray so bigv, amir, perkins with acy and late pick center as the developing bigs under contract.