I think Dez is signed long term, Free is let go and Murray is franchised. We could draft a guard in the 2nd or 3rd (like they would have done this year with Trai Turner) and move Martin to RT.
Biggest salary cap question for next year I think, will be Carr.
I'm not so sure I would even want to move Martin, he is playing so well. Maybe they will want to, but I'm not sure. It is no gimme that Martin would be as good at tackle. He has shortish arms for tackle and his movement is really nice at G.
Dallas is going to have some money to spend in free agency next year. I would like for them to go RT and DL in free agency if available. A good RT and DL pick-up would be a big help and would allow the team to continue doing what it likes to do in the draft... namely take the best guy regardless of positional need. It also is something that I strongly agree with.
They could take the best LB, DE, DT, or Safety that was on their board.
The lone weakness on the OL would be taken care of and you're not asking Martin to move from a position that he plays exceptionally well. Another good body would be added to the DL (at end or tackle) and if we draft another DL in the first or second (or both), then there could be at lest 3 new trench players and maybe 4.
If dallas went S in round 1 and DL in round 2, then the OL would be improved, the DL would have 2 new people, and they would add a premier player at FS. That could go a long way towards getting the team over the hump.