I've been pondering this for a while. I can't remember any 4 td games and only remember one game with 400 yards. I'm not saying great QBs need to do these things consistently, but that it seems like even mediocre ones do it once in a while. I can't remember any statistical explosions from tannehill. Ever.
Just did a quick scan. In 2012 he has his only 400 yard game. He has had just 9 games with 3tds and 3 games with 4 tds. He's never had 5 or more. I don't say this to prove anything about him, just to let any other curious parties know .
Also this isn't to say anything about tannehill being bad or whatever (though I personally have never had faith in him), just confirming what I've thought, he doesn't put the stats up so things damn well be working around him.