Agreed on your first part -- some of those guys weren't good enough. Letting them go was the right decision, but why were they brought in in the first place?
Ali was absolutely not recruited over, that's such a ridiculous take. Ali blew up at an AAU event and decided he wanted a bigger stage. KO was left at the altar. The fact that we got Adams later was a consolation, but is largely unrelated.
The last 3 are worrisome. Either he's not bringing in the right guys, or he can't get them to stick around. I'd include Hamilton in that category as well, frankly.