Honestly, Briggs is great LBer in that system. It's the dreaded tampa 2, where the WLB makes all the plays. Look at Indy, Cato June made all the plays. In Tampa, when they moved Cato to the strong side, he didnt make many plays because he's not in the playmakers position, Derrick Brooks is.
Ultimatly, we dont play in a Tampa 2, niether do many other teams. That coupled by the fact that he wanted more money probably turned off many teams. He seemed like a boom or bust type of pick up. Very similar in some degree to Jason David, a system guy playing out of his system.