Don't forget maybe, just maybe -he learned a little bit from Larry Brown, Tim Floyd, Larry Bird, Flip Saunders, Johnny Orr, etc... The NBA has a very long season and that's a lot of practice time he's spent going over defense, offensive plays, etc...
Not many better than Larry Brown in the NBA, or Tim Floyd in college.
I also imagine he will be a better closer than most head coaches from day 1. Where he may be most lacking is being a head coach, but I think he has a ton of experience in the gym with high talent and his intelligence will close the gap on those with more experience.
If we keep Nurse on board (pretty sure he was JP's hire, not Mac's -conspiracy alert) -we have our X's and O's guy. Grayer is our post guy, Fred is our guard guy, TJ is our main recruiter. Nab another recruiter and hopefully Nurse's foreign contacts (10 years!) will bear some fruit as well.