I dont think it matters, Hatton does not execute game plans anyway, he gets overexcited and throws his tactics out of the window, thats not his trainers fault.
Steward would be my first choice if I were him, but is probably unavailable since Wlad has a fight coming up soon. Roach would be a great second choice, but would want him in great condition, which might push a fight back till fall...or winter. Moorer is not nearly on the same level as Steward or Roach. Better options are Buddy McGirt or Richardson.