There is very little difference in the look of an assistant coach vs. that of a head coach, but if you look a little closer, you will see.
The head coach has the strain of the program, the assistant coaches basketball and doesn't have that strain.
The head coach deals with so many minute issues many of which are small but proposed by someone who thinks they are large.
The assistant coach listens to the head coach, if they have never been a head coach they think what they would do differently. If they have been a head coach before, they may do it, but they also are glad they don't deal with that anymore.
The HC never does not think of the program...it causes stress, gray hair and losing of your hair.
The experienced assistant may have to be brought back into focus when it comes to the program because they have other issues they are dealing with.