His not being in games late probably has more to do with free throw shooting.But, Painter has clearly lost faith in him as evidenced by him not being in the games late and relying on Biggie at the 5. Which is fine, but that's a result of Haas committing too many turnovers and not converting on a number of point blank bunnies.
I'm fine with Haas being a 6th man, he's a helluva player to bring off the bench. But, I also believe he's talented enough and has the tools to have a more positive impact and he's simply not using those tools correctly.