I always thought one of the biggest complaints about Jim was he never let his assistants have any say. Although I see what you are saying, you are talking about one-on-one stuff.
But remember Jim was an assistant coach for years and year.
Assistant coach at 6 different colleges, and an assistant coach for 6 seasons in the NBA. So he's been an assistant coach for a lot longer than a head coach. Actually my sense is he is probably better at the typical duties of an assistant coahc han a head coach