I see the benefit in Anderson Silva still being a UFC fighter. While he is 44 years old and has only one win since 2013, he still could beat most of the middleweights on the roster. He’d probably handle the majority of the light heavyweights as well. His name still attracts attention and some exciting style match ups are still out there in either division, such as Uriah Hall or Sam Alvey.
At the very least, Silva would be immediately courted by a who’s who of every other major promotion out there.