The window is absolutely not shut.
this D is still going to be good which automatically puts you in the conversation. Match with a weak division and playoffs are likely. Now let’s pretend, cincy wasn’t the best team in the AFC last year (they weren’t), so a playoff trip means legit chance at SB shot.
the biggest question marks aren’t if the window is closed, it’s if Downing and THill can get out of the way enough to actually use the window. henry still has a couple more years at least, run the ball, play it safe, let the D win games. Titans just beat some of the best the AFC has to offer (and NFC considering they beat SF and LAR).