Oh, well yeah, maybe. I think Collins could play RT too, but it's really going to depend. I don't think Collins would be as good at RT as he would be at LG. And I don't think they're going to pay Leary a bunch of money on that theory. I think they'll plan on Collins playing LG, maybe take some snaps at RT in camp, and see if he has any future potential there. I think he's a lock right now for LG for at least next year.
They won't sign an OT in FA. They have Free/Green and maybe Cleary. If an "upgrade" is coming, it's going to come via the draft. Tackle class is weak, but i'd expect one as high as the 3rd if someone great drops. Otherwise just some 4-5 round guy if we take one at all. I don't really like it, but that's the way they'll do it.
No they probably won't sign a free agent OT; however, if Collins could play RT, then they could cut Free and his 5M salary. That would pay most of Leary's salary for 2017. The great thing about that is that if a Guard got injured, then Collins could move back to OG is Green was healthy. We know Green can play if healthy. He was very good in 2 starts at LT. The problem is obviously that they can't depend on him to stay healthy.
It could come down to deciding between the following:
LG Collins
RT Free/Green (Maybe Green can beat Free but Free's salary likely remains at 5M either way)
LG Leary (My guess is about 6M average)
RT Collins/Green (Green will likely be healthy if he is the backup. That would allow Collins to move to Guard if needed (Green-RT, Collins-OG better than Collins-RT, Looney OG).
I don't expect Leary to be re-signed but I think they should consider it; although, he might not want to re-sign with the Cowboys due to being replaced by Collins despite Collins not really winning the job).