people seem to like Doc Rivers, and he's been effective out of time outs. He's played under some great coaches, the best ever, and probably has a couple of those plays in his head somewhere.
But it's not like players follow Doc because he adds something that makes a difference in the scoreboard, and it's not why he is considered a top coach now. Doc won't add points, and nothing he does will really move the needle on a team, I think.
Doc is excellent at gaining buy-in from his players, which is essential to team success. A team that has the pieces should consider hiring Doc to ensure they perform as expected.
Brad Stevens seems to like the coaching aspect of basketball in the sense that he studies everything looking for a little edge that others might miss. HE tries to put players in positions where they are most likely to do well. He is able to figure out what that thing is that each player does well, and incorporates it into the plan.