The main thing I worry about with Gilbert is - how many players have been suspended for PEDs and then gone on to do anything of note after that? There are maybe a couple examples I can think of, which were Joe Haden and Dwight Freeney, and both of those were for stimulants. Anyone who's tested positive for steroids or hormones has generally played a couple unremarkable seasons afterward before being out of the league. Either they are constantly injured or just can't cut it anymore. Maybe Gilbert is the rare exception to that, but I do not like those odds.
As for the others, Finney is a no-brainer to keep; I think he will eventually replace Ramon Foster as a starter. Feiler as well, as we can keep him for cheap.
It is kind of a good point Gonzo brings up - hard to tell where exactly Hubbard fits in for the money and in terms of his role as a long-term solution. For an interior lineman, I'm perfectly happy with Finney. BUT if the Gilbert thing plays out poorly and we need a guy who can play OT, maybe Hubbard becomes our option by default.
The worst thing IMO would be if Gilbert goes into a steep decline and we keep him around for a couple years trying to force it, and those other guys move on and we've got to start from scratch, possibly without Munchak. That would be a disaster.