He was worse this year but the overall theme was always the same with him. If you look at threads before the 2017 season you will see
Can't throw over the middle
Doesn't fit it in small windows
Not an anticipation thrower
Reads half the field
Runs/bails on pocket too quick
The one thing that really dropped off for Taylor this year was his long ball. He used to be terrible with over the middle 15 yard throws but really good with long bombs, maybe losing Sammy and Goodwin contributed to that but his long ball game was awful this year.
You make a big case that Dennison's offense was not a fit, what offense is a fit for Tyrod the wishbone? Read Option Runs?
Fact of the matter is regardless of the scheme, he struggled as a passer.