The Redskins don't look like they are going to make a move for a new running back, so they will have Samaje Perine, Rob Kelley and Thompson. One of these guys is not like the other. You guessed right, it's Thompson, who is a dynamic open-field player. I like his chances to put up good numbers with those other two as his competition for touches.
Lewis should be able to find a team in free agency that will commit to use him more than the Patriots did early in the season. Of course, the Patriots were a special offense that helped him, but as the lead back on many other teams, I'd feel safer than if he were competing with three other backs, like he was in New England.
Ertz has similar upside to the top two tight ends here, but he also ha more competition for targets. As long as Philadelphia remains a pass-heavy offense, I expect Ertz to be consistent, which is extremely tough for tight ends not named Gronkowski and Olsen in recent years.
Olsen could be a value play this season, as his injury pretty much took away his whole 2017 and he's likely to once again be a top-two target in a good offense. Age and injuries are a concern, but I don't think we'll see a big decline from him.