a coach finds players to fit his system. In football, you can tweak your system for a specific player, say WR or TE as example, but in basketball you don't have 11 guys on offense and 11 guys on defense.
Every single article of the top MN guys committing elsewhere, they are always quoted as saying "I love the (insert coach) system, it fits me perfectly" from Chet to King to Suggs, etc etc.
So ideally he has a system, but it honestly sounds like he is not sure of what he is going to run.
That is OK. People on here get upset when others question what system hes going to run. He's never been a head coach, he doesn't know yet