My list (in no particular order):

1. At least 1 big, fast receiver who can catch.
2. A big time inside linebacker
3. Consistent QB play - from either Baker or someone else
4. Commitment to running the ball and not being worried about "saving" Chubb

Not suggesting we draft a QB, but if there's one the team likes (IF they decide Mayfield isn't the one), you could do worse for a rookie QB than to plug him into this offense with it's potential to run the ball and play-action. It could be that rare situation where a rookie QB can learn on the job without taking the beating that some have taken due to being on a really bad team. Think of Kosar with Mack and Byner as somewhat of an analogy. It might require trading up, or one (Pickett?) might be sitting there when the Browns draft.