They need to find the very best backup OT. In theory that should be Collins. If the top backup OT can beat out Free that would be good, but the primary focus should be finding that top backup. Is it Collins, Green or Weems?
The biggest issue with Collins focusing on Guard and having Green or Weems as the backup OT is that they only have 7 active on game day. With Bernadeau as the backup Center, that would put either Leary or Collins on the inactive list.
If Collins struggles playing on the Right and Green or Weems is clearly better, then move Collins to OG, but IMO, he should be given all possible chances to win the backup OT spot. If he excels there then he could also push Free for the starter's job.
It would be good if someone else could be the game day backup Center because that would give them the option to have Bernadeau on the inactive list. I think Martin could probably do it. They had him practice there a little last year in TC.
Leary will be a restricted Free Agent next season so they don't need to give him a contract. It will cost about 3.3M to use the 1st round tender or 2.2M to use the 2nd round tender on him. That give them plenty of time to decide if they eventually want to give him a contract in 2017.
Any of the young OTs could probably move to Guard. They all have that type of build. Gibson is probably the least likely, but the other 3 have the build to play either.
Collins 6'4-1/2", 306
Green 6'4-1/2", 314
Weems 6-5, 320
The current starters plus Bernadeau are 6 spots. If they keep 10, all of the previously mentioned young guys could make the roster. A broken finger is probably not enough to put Gibson on IR, but that would make things easier. I don't see him being ready to contribute in 2015 because he is far less developed than Green/Collins.
I could envision the 2017 OL as follows:
LT Tyron
LG Collins or Green (Leary was tended for 2016 and moves on in 2017)
OC Fred
RG Martin (also serves as the game-day backup Center)
RT Collins or Green (Free lost starters job in 2016 and moves on in 2017)
Top backup Guard Weems (This is obviously the least likely as Weems has yet to even practice at Guard)
Top backup OT Gibson