I've have no idea what is going on here.
My first impression is that Gruden and company are going with the theory that if you throw enough shit against the wall some of it has to stick. That being written both Garcia and Plummer are better fits for Gruden's west coast offense than Chris Simms. Plus, with Plummer on board the Bucs quarterbacks, on average, are slightly less effimenate. And if Plummer regrew his beard it might make the Bucs quarterbacks the most manly squad (again on average) in the NFL.
With this many former starting quarterbacks on the roster you can expect two results: 1) a very heated training camp battle, and 2) a lot of media hype surrounding the Bucs going into the season. I think Garcia is the odds on favorite to win the job for the upcoming season, with Plummer set to enter the roll of quarterback for the future. Which leaves Simms as the odd man out (and a very good chance that Simms sees the writing on the wall and asks to be traded). But ESPN has been wrong before so we'll see how this plays out.
UPDATE (1:54 pm): ESPN is now reporting that if Plummer does retire then the Bucs would not have to give up a draft pick. Rumors are flying in certainly one of the most interesting Buccaneer offseasons in recent history. Some of the more interesting ones.....
- Bucs may try and trade the rights to Plummer to the Texans for either Carr or a draft pick.
- Bucs may try and trade away Simms, maybe to the Raiders.