So you're position is james Jones made a good pick but did not pick up the options because he was in a power struggle with the head coach and Sarver had nothing to do with this situation?
I don't see the point in splitting the blame. It was a good pick based on what we've seen from Stix up to this point. He's shown he has lottery pick talent. It was a mistake to let him go in the way he did, declining the option and then trading for someone limited in terms of impact who costs more next season than Stix would have.
It doesn't matter if that decision was made solely by JJ, Monty, Sarver or some combination of them together. Letting him walk was bad, so was declining the option because it limited the Suns in what they'd get in trade as well. His contract was too small to have value as an expiring contract also, which is another reason it was dumb to decline the option.
JJ is the GM so he deserves blame and so does Monty as the coach for not playing him. Throw Sarver in the also if you'd like. I don't necessarily fault him for it but it wouldn't surprise me if he was looking to cut costs. JJ took on more salary in letting Stix go so I don't really blame Sarver so much as JJ's inexperience.