They could be aggressive like ATL was last year, with their elite players.....
I'd bet on Lee in AA to start, and in STP by June. I doubt Lewis is running full speed by early June. I hope to be wrong.
I have no idea if Lee can play SS, so I won't say what they should do. Given what little we know, I'd move him to 3B or RF because you are really hoping Lewis is your SS. Miranda can play 1B or DH if Lee is at third. I'd put Martin at 2B or LF or CF at this point. He's not a SS given Lewis and Lee.