Millsap is just an undersized PF, but OJ Mayo - despite sucking for the entire year and getting traded for garbage - is SMOOOOOOOTH athletic. Man, he was so good in high school in West Virginia, he's better than Paul Millsap. Forget that Mayo is a 6' 4" SG with no hops, no arms, and has to dope to even have barely requisite strength for his position. OJ Mayo, man, coming off the bench and shooting 40% on the year and having bad shot selection is totally their core. What would they do without him? Besides win when he plays less. Nothing says "core" more than a guy that's getting by more by what he was supposed to be/where he was drafted than anything he actually brings to the table.
Honest question, have you watched OJ Mayo this year? Did you watch him in the game against OKC? Can you honestly say he did anything but help the Thunder? If you answer yes to all of those questions, you should have your ability to express your opinion revoked.
Dude, Mayo has a 41 inch vertical. Have you watched Mayo this year?