Yes GREAT NEWS!! , having someone devoted all in to a team and its players can't be a bad thing.
If he has Rondos ear and help Doc "MANAGE" the personalities , keep EVERYONE on the Same page.
Doc probally needs to KNOW what the true feelings on the team are , and somebody to head off "playing time" problems, trade rumors , ect , ect ... Dooling is going to baby sit the team . Keep them all pointed in the same direction.
With so many GOOD players on one team , everybody thinks they should be playing or starting . Dooling will be a COOL HEAD in defusing tense situations and building team cohesion.
I predict the Celtics will start playing better with Dooling keeping the bench energized and READY to PLAY !!