I certainly get your point...I think we could easily get Noel 25-28 minutes per game though. He'd instantly be a better option off the bench than Frye, who isn't even useable against GSW.
I get the difficulties it presents when TT and Noel can't play together, but as a back-up to TT, and in spot minutes next to Frye, he'd be very valuable. His defensive flexibility is spectacular...his defense alone, could potentially allow Frye to actually be able to stay on floor against GSW....maybe. At least Noel could take Green, allowing Frye to play center-field against Iggy, which is still scary....
At a minimum, you have a back-up big in Noel that can step on the court against GSW and you might be improving your defense. There are few bigs in the league that you can substitute into a line-up for TT, and actually expect pick and roll defense to get better....and Noel is one of those guys.