Do we still have our bi annual exception? I would try to get Ed Davis with it. However, that might seem like a longshot. We would have to pull off a trade shipping at least one of our PFs out of town to make room for him and to stay under the tax.
I think it makes some sense to have a big man rotation of Cousins, Thompson, and Landry with Evans being the 4th big. Granted Evans was starting last year due to his low usage and rebounding, but the more we 'showcase' Thompson and Landry, the easier it should be to move them. There have been many big men who have gotten much bigger deals than what Landry got last year, so hopefully it will make his deal and Thompson's deal more desirable come this years trade deadline.
The only problem I have with this is it means we would be changing up the roster in the middle of the season yet again, but I think what's important is that our core would have a full offseason together (Cousins, Gay, Stauskas, McLemore, Collison, & McCallum). Dumping say Landry (who's stock should elevate if he can return to form) and McLemore for a shotblocking big hopefully would not impact our team's chemistry all that much.