Sonnen winning I don't think was an upset. He dominated Filho until that armbar the first time they fought, which I don't think he even tapped to, he just yelled. Anyway either Filho was high as shit during that fight or was delusional from cutting too much weight. Seriously that was just fucking creepy watching him just stand there talking to invisible people lol.
Also Faber losing doesn't say anything about his skills other than he's human and got caught. The feeling out process quickly made it pretty clear that Faber was the better fighter, and he got cocky and tried that retarded ass elbow which got him dropped. Much like GSP losing to Serra, that lose was probably the best thing that could have happened to him. Shows him that he's not invincible and if he keeps trying to pull that shit like he always does hes eventually gonna get caught.
No doubt that Faber is gonna come back and dominate him, if he doesnt get too shaken up mentally(which I doubt he will).