Thomas has been battling hip issues for awhile. While he claims he is "healthy", maybe he means as healthy as he's gonna get. That makes me wonder whether he will have the same late-career life that Andre Johnson had. I suppose you might say this is me 'doubting Thomas'.
Regardless, I don't really care about anything after this season re: DT anyway. I doubt he's back in 2019 at his current salary, so Thomas just needs to keep his half honest enough to let Hopkins work.