The Niner's defense has been exposed. If Cousins was able to shred their secondary just imagine what Burrow can do. And San Francisco isn't a team that does well coming from behind. Under Shanahan SF is 0-36 when behind by 8+ in the fourth qtr. They have to be up and by double digits. When it gets tough Kyle isn't as brilliant. And factor into that he has, basically, a rookie QB, who is very talented but has struggled in his last two outings against physical teams. The sort of teams that Cincy mirrors but with a bit more firepower on offense.
This is a winnable game for both teams so I wouldn't be surprised if it comes down to the wire like San's last two games.