A couple of things. There are two different interviews from Locker Cleanout Day. There's the ones on 1280, and there's the ones on the Utahjazz.com site. If you listen to both, you will see that Kanter was clearly trolling RJ. RJ was trying to play super-vet and sin him, so Kanter trolled him by saying offense is more important. When asked seriously about it, he said you need both! Dennis Lindsey when asked also said the same thing. It is true, you need both. Those who win the title have enough of both.
Also, when listening to the two interviews, it is clear that he was upset that the C5 didn't play together, which is what they were told in the offseason. He was scapegoated for the 1-14 start, and thus didn't get too log as many minutes with the other C5. Also, he was clearly more efficient than Marvin across the board. Corbin threw him under the bus and let the media go to town on him. He has a right to be angry. He had a shoulder injury that kept him away from basketball all offseason, and then he was judged very harshly for not being ready for a completely new role, while playing with two jokes for Pg's in JLIII and Tinsley, and then punished for the team's losing, in a season that was meant for development. I don't think he's entitled, I just see him as not wanting to be the scapegoat. Like you said, basketball is a team sport, and our whole team sucked during the 1-14 stretch, mainly because key pieces were injured.