Is Head Coaching a full-time job?

I brought up Pete Carroll in my earlier post and then removed it to just show active coaches. He was a top tier motivator until he began to coddle..
Let's keep Carroll in the conversation. Yes he's a great motivator but very good at X's and O's as well. and he failed as a HC before in 2 NFL jobs even before USC. The fact of the matter is there is more to being a great HC than motivation you need to be very good @ X's and O's to be a success in the NFL. But it's more likely that a HC can be successful being great at X's and O's and not so great a motivator like Shanny or Reid