I think you should be praising Watson for saving OB's arse since his arrival b/c everyone knows the Texans defenses were marginal at best, the OL's among the worst in the NFL and offensive skill position players who were hurt more than they played.
I just don't understand all your vile hate towards Watson based on a 5 game stretch last season when it was apparent the OL was shite after injuries and a lack of talented depth, the running game that fell apart after Hyde wore down late and a lack of talented depth, of course the WR's had a chance to be great but injuries and a lack of depth derailed their impact late in the season, TE's were used primarily as additional OL due to a piss-poor OL, and last but not least, operating in the most predictable offense in the NFL might have had an impact on Watson's last 5 games.....including the lingering injuries he played with.
As for the 51-7 debacle......51 points were given up by OB, ST's and the defense. I never remember Watson heading onto the field with the ST unit or lining up on defense. OB didn't have the balls to crush the Chiefs when he had the chance, he went into protect the lead mode as do most HC's on the end of losing the biggest leads in NFL playoff history. They're not coaching to win the game....they're coaching not to lose the game. Just like a good old fashion prevent defense. If the Texans had somehow gone into halftime up 31-0, 27-0, 31-7, 27-3, etc.....OB would've had Watson trying to manage the game through a predictable two run and a pass play pedicated on 3rd down being less the 6 yards, otherwise it would be a safe run up the gut and trot the defense back onto the field to protect the lead. It's the way it was and will always be with OB as HC.