You keep missing the bigger picture and the whole point of this thread, which is Crowton. At the end of the day, what's the most important stat for an offense? Points on the board. That's the whole point of an offense. The offense Beck directed, without any doubt whatsoever, to a very large quantum leap forward from '04 to '05.
Where they scored 24 pts per game in '04, they scored 33 pts per game in '05. Which gets back to that 15 TD stat for Beck. You brushed it off, but that's what matters most for an offense. Did they put pts on the board?
A 9 pt leap per game in pts on the board is a quantum leap. A 3 pt step up is a refinement. Beck refined his game from '05 to '06, which was to be expected given a second full year in a new offense. But Beck to a quantum leap forward in what he could make an offense do from '04 to '05.