Robinson is playing out of position imo. He does pretty well when its a bad team, but he is still grading out very poorly and struggles mightily against good players.....in this year he should be showing signs of dominating, not having worse ratings (-8.1) than rookie Rob Havenstein (-3.6). Joe Thomas is still grading out very high at +13.0 (consistently only giving up 4.5 sacks per year his entire career), and its insanely rare to have this kind of talent available on the market....he is the only OL in the history of the league to make a pro bowl his first 8 years. Its a significant area of need, and I think you take the approach of the teams in recent years (Giants and their DL, Steelers, Patriots, Seahawks etc) who made SB runs that if you need 1-2 players to get over the hump you go get them and make your run before free agency rips your roster apart. I would argue left tackle and a #1 wr are the only places this team really desperately needs help to be a SB winning team. Money wise, I dont think the Rams can keep this nucleus intact for more than a few years so strike while the iron is hot.
I think the Browns probably at this point realize its going to be 4-5 years before they can build a team to do damage and by that time Thomas wont be able to help them as much, so they might as well get what they can now and trade him to a team where he can make a huge impact right away. If Foles has protection to help not turn the ball over, I absolutely believe this team can win a SB on the strength of the defense. I would personally love to see this happen, but it depends what the Browns want.
At his age, no way they will expect a very high pick.