I think any trade of a current player is unlikely, but if it happened I actually think La'el Collins could be the guy traded because he could play any OG or OT position. Plugging a hole at LT is a lot more valuable than a OG position.
But at this time of year, I'm all pick-grabby and draft-handsy.
The other option is that Chaz Green reportedly looked good in practice and could be ready when Doug Free is done (which is likely after this season IMO).