Why bring a "random third string goalie" when we could have Brad Friedel?

Here's the January workout roster (ie the guys who may play reserve roles):
Goalkeepers: Kevin Hartman (Kansas City), Troy Perkins (Valerenga, Norway), Nick Rimando (Salt Lake), Zach Thornton (Chivas USA)
Defenders: Kevin Alston (New England), Jonathan Bornstein (Chivas USA), Jimmy Conrad (Kansas City), Omar Gonzalez (Los Angeles), Clarence Goodson (IK Start, Norway), Chad Marshall (Columbus), Brandon McDonald (San Jose), Heath Pearce (Dallas), Marvell Wynne (Toronto)
Midfielders: Kyle Beckerman (Salt Lake), Alejandro Bedoya (Orebro, Sweden), Geoff Cameron (Houston), Brad Davis (Houston), Brad Evans (Seattle), Benny Feilhaber (Aarhus, Denmark), Eddie Gaven (Columbus), Sacha Kljestan (Chivas), Jeff Larentowicz (New England), Dax McCarty (Dallas), Chris Pontius (D.C.), Robbie Rogers (Columbus)
Forwards: Justin Braun (Chivas USA), Conor Casey (Colorado), Jeff Cunningham (Dallas), Robbie Findley (Salt Lake), Marcus Tracy (Aalborg, Denmark)

I think Findley and Tracy can really work well together and they both have a very good shot at earning the chance to contend for that last striker postion. I find it odd that Eddie Johnson isn't on this squad, it either means he's on the team OR that he's off the team or that he's on the fence based on how Findley and Tracy play.......ENOUGH ALREADY with the Conor damn Casey!!!!

Marvell Wynn is a darkhorse for wingback and CDM he's very quick, a lot of upside with him (same as a couple other players).

Jones and Edu are unknowns but at this point so are DeMarcus Beasley and Eddie Johnson...they have all the potential, in the world but never seem to come up with results when they matter. And if we're judging players 100% on potential why all the hate for Freddy Adu? He's young, talented, he's quick, he can put the ball in the goal and he can pass....I just think the guy needs a chance to develop.

I'm sure Bob Bradley will figure something out