Even though I've been on the pro-JJ train in this thread, I wouldn't say this is true. JJ wasn't a great positional defender at Utah, Theo was much better across the board on defense except for rebounds.
Based on your posting history, I think that your basketball knowledge needs to be respected. I guess I'd feel better though if I knew where your opinion that "JJ wasn't a great positional defender at Utah" comes from.
My comment was based upon that portion of the article where it said:
"Jayce is a very good post defender but I wouldn’t say he’s a rim protector. He will not block a lot of shots
but he plays very good position defense. He is a big body, a 7 footer
who does not get pushed around on the blocks very easily. He was the best rebounder on Utah’s team last year. "
Also, a number of posters here last season made the point that at times Theo would give up his position under the rim to chase after blocks.