Phil Jackson had a system, but he also had MJ/Pippen and then Shaq/Kobe. It didn't really much matter what system he was running, they were going to win a lot of games. Phil's best attribute was his ability to manage personalities (see guys like Dennis Rodman and Ron Artest). He was a good coach, but probably overrated in the grand scheme of things.
As to the OP's question, I think Stevens is a genius of a coach when running a system with less talented players. This season seems to be a bit of an anomaly with so many integrated parts, upcoming FAs, the veterans vs the young guys, etc. I am not going to hold much against him right now and we still could really surprise in the playoffs.
If we acquire AD, Kyrie re-signs, Hayward is 90% of his former self, and other players like Horford, Brown, and Smart are still here playing at a high level and we begin to flounder, then I may buy into the premise. But, right now, it's just impossible to tell. The useless Rose Rule essentially ruined 3 different franchises this year (us, NOP, and LAL) as we wait to see what happens this summer.