Although he may well be toast, I wouldn't count Hightower out yet. I remember the first couple of games of the 2018 season, after he was injured and out for much of the 2017 season, he looked incredibly slow and toast. The one play that stood out was when he got easily beaten around the corner by a runner. He looked like a 350lb lineman trying to turn the corner. Maybe he just needs some full speed game time to get back to where he was. Granted, he was 3 years younger, but I would wait a few games before being overly concerned.