European coaches are known for being authoritative and unassailable which is one of the reasons that NBA teams have shied away from looking to Europe for coaching prospects. Messina seems to be no exception.
He has a strong personality and, at least in Europe, was atough coach to play for. He famously cut several of Real Madrid’s star players upon arrival, electing to go with players that he felt were more malleable.
.... Messina’s teams also play a relatively slow pace by most European standards, preferring an efficient half court offense that plays through the post.
....He also states that his teams needed a minimum of 20 FGAs per game from the post. He talks about how the team should constantly look for opportunities to get the ball to the Center, where the defense is most forced to react. Messina is known for his development of post players and it seems clear from that article that he values low post players quite a bit. That isn’t to say that he only focuses on scoring from the post. His diagrams are full of all types of plays and the emphasis on getting the ball into the post seems more like "step 1" rather than the end goal. In a separate interview while with the Lakers, he talked about the importance of floor balance and ball movement.