5 former New Orleans Saints who could come out of retirement and compete

Could any New Orleans Saints actually come out retirement and compete for a roster spot?
Rob Gronkowski coming out of retirement to play with Tom Brady and the Tampa Bay Buccaneers got us wondering which former and currently retired Saints could come out of retirement and do the same.
Making this list was a bit more difficult than I anticipated as the Saints have had so much great talent over the course of their recent history. However, not all really have the longevity to potentially make an NFL return.
In order for a player to be considered for this list, I take into account how many seasons they played in the NFL, how much tread they have on their tires, and how long ago they hung up the cleats, all factors that would be taken into consideration if a team were to bring back a retiree.
There are many great options who could return from retirement and give the Saints a little more magic, but here are my top five guys.