Yes, he's a serviceable 5. He can't be the focal point of an offense (we saw that beginning of last year), but he does the yeoman work fairly well (his rebounding > his offense > his defense).
But we have 2 other good to serviceable 5s, though. One better on defense and the other better on offense. The issue comes when people go "Well we have these 3 pretty good (but not really good) bigs and our bench wings kinda stink, why don't we just play 2 at once? Let one play the 4? Really pound the opponent."
And it can work against some teams. Teams that don't space us out when we're on defense. Teams that really let us pound the glass.
But it has not been working. Here's the last 30 days (last 7 games) of any combination of 2 of Whaley, Sanogo, and Carlton vs. every other lineup and the overall average. On is with 2 bigs, off is any lineup without 2 of the bigs, and baseline is overall average.
We shoot much worse at the rim with 2 bigs. And much worse in the midrange with 2 bigs. And we turn it over more. And we take less bad midrange 2s and more valuable 3s with less than 2 bigs. It all paints the obvious picture: the paint gets clogged when we play 2 bigs.