I assume you haven't heard of Silva before coming to the UFC.
He's already beaten top middleweights, Jeremy Horn, Jorge Rivera, Lee Murray, and now Chris Leben. It's not like he's an inexperence fighter like Nate Quarry. You can make an arguement Silva has better wins then Franklin.
Nope, Matt Hughes might able to beat him that time. But 1st he'll have to get past BJ Penn, because GSP will have to fight the winner of TUF4 for the title next.
He fought welterweight in TUF3.
The TUF IV winners will have to wait a minute because it's generally acknowledged that the winner of Parysian vs Sanchez will be challenging GSP for his newly won WW title.