Players play and coaches coach. It seems logical that a coach would have had at least some experience as a player; however, just because one was once a good player it doesn't automatically follow that person will also be a good coach. The ability to perform at a high level (at least at some point) doesn't always translate to the ability to teach others how to perform at that same high level.

 

The teaching/leadership skills of a good coach are a separate skill set from what most players posses. Maybe Boselli could be a good coach, but the only verifiable way to know is for him to coach and then see what kind of results he gets... Preferably starting with a college position; the pro level is no place for amateurs. 

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