Not sure what you're talking about with regards to the offense. The offense is and was absolutely built to score lots of points, sans QB. Two top 10 OL rounded out with serviceable starters, a top 3 RB, the best backup RB in the NFL, top 5-10 talent at WR with a solid number #2 and #3.
What part of that offense isn't supposed to score?
We're talking about TT's level of play in the offense.
The offense got better because McCoy played better. Not because TT played worse.