I expect a lot of improvement. Consider this:
1. Second year together, full offseason together, and it often takes a full year or so to get in sync with ridiculous speed.
2. Brandon Gibson was showing very well pre-injury last year, and with him in the lineup the offense kept the chains moving, meaning more chances to throw, and more opportunity to wear the defense down.
3. Tannehill rarely had a clean pocket with time to throw last year. No matter what, the presence of Branden Albert will give Tannehill more time to decide, more time for Wallace to get open deep, and allow Tannehill to focus solely on his downfield throw. Likely drafting of scheme-fit pass pro OL should bolster this.
4. Natural progression of a QB who has shown the ability to learn from his mistakes and continually improve.
5. After that season, Wallace will play with a chip on his shoulder, and let's face it, he dropped a lot of balls last year.
6. Our run game was non-existent under Sherman and our atrocious OL last year. Lazor always produces a decent run game. This takes some of the focus off of Wallace and the pass game and wears out the defense over time. Also, Tannehill is very good at play action fakes. If we generate a run game, they will be very effective, particularly over the top to Wallace.
7. Bill Lazor. He is excellent grooming QB's. We saw what he did with Nick Foles, who IMHO is less talented than Tannehill. Lazor also utilizes a lot of elements that Sherman didn't, like screen passes, motioning the WR, moving people around, disguising formations, etc.