I think trading for Olsen would be HUGE! I wanted the Dolphins to get him so bad in the draft... He would make Fasano better just as Martin did and would flex wide all the time like Gates. Or trade for him and grab Dez if he falls to 12...
You could just look at Ireland's list of core players. He lists core players as QB, #1 WR, LT, CB, pressure players. I slightly differ from his opinion b/c if you look at the correlation between SB winners and pro bowl players you find that QB is the most common followed by WR, S, LT. So I would include S among my core positions. It's not crazy. It's just the way the game has evolved.