Keep him on the roster, but bump him to reserve, if his contract is friendly enough.IDK...that SHOULD be the case, but he's signed thru the 2020 season.
Foster actually has played pretty well this season, but he's on the roster because Ben wanted "his guys". They just couldn't justify keeping Gilbert, but they obliged Ben with extension deals handed out to Pouncey and Foster. Obviously the contract is not very toxic if they choose to let him go in lieu of Finney. Very possible for that to happen if Foster misses a few games here. Finney got a nice bump in pay for '19, but will be a UFA next yr...now I'm wondering if he will be too expensive.
Losing Finney would suck. Shouldn't happen to let Foster play out the last year of his deal. Gotta play the best 5. And Finney is in the best 5. He's also a good fill in for Pouncey when he goes down. And could be a bridge replacement when Pouncey is done.