Lol, Faber for number 1? Seriously?
I mean yeah, he's one of my favorite fighters but the feather weight division isn't exactly what you would call stacked.
Who has Faber beat that's worthy of mentioning? Jens Pulver and Jeff Curran are really the best he's beat, and while both are great fighters, neither are worth of mention in any pound for pound ranking.
GSP? I agree he should be above Silva, but not Fedor. Some worth opponents he's beaten are Karo Parisyan, Frank Trigg, Sean Sherk, B.J. Penn, Matt Hughes and Josh Koscheck. Among those, Penn and Hughes stand out as amazing competition, Penn is still in the P4P debate and Hughes definitely was before he was destroyed by GSP. St. Pierre has definitely proven himself, but not as much as Fedor.
Let's take a look at Fedor's record. First of all, he has zero legit losses. The one loss cause by a stoppage from a cut from an illegal elbow was quickly and convincingly avenged. His worth opponents: Renato Sobral, Heath Herring, Antônio Rodrigo Nogueira, Mark Coleman, Kevin Randleman, Mirko Filipović, Mark Hunt, Matt Lindland, and Tim Sylvia. 5 of those men are previous UFC champions. Big Nog still is a P4P great, and CroCrop was before he was destroyed by Fedor.
I think the main thing that separates Fedor and GSP, is the fact that GSP was stopped twice. Even though he avenged both losses, Fedor has never legitimately been defeated, which gives him the slight edge in ranking. Otherwise it's an extremely close arguement.