The question to ask at this point, 11 years later, is if Smith still has something left in the tank to help the Patriots.
If Belichick and his staff determine that he does, a potential role should be pretty straight-forward.
Reflecting on the 2004 draft, Belichick said he didn't view Smith as an outside linebacker/defensive end hybrid as much as a pure pass-rusher. It wasn't necessarily that Smith couldn't drop into coverage, but Belichick compared the situation to Julius Peppers in that a coach wouldn't want to drop him into coverage because it took him away from doing what he does best -- rushing the passer.
Smith ended up going 18th overall to the Saints. The Patriots then drafted Vince Wilfork 21st overall.
Smith's visit to New England sparks thoughts of the possibility that the duo could be lining up alongside each other in 2014.