He's coming off a horrible injury and is getting limited playing time. Of course he won't rack up amazing stats. I think that he has shown what he can do often enough. Just look at his stats and tape from before the injury. He could'v easily been a pro-bowler/all-pro multiple times.
That said, I don't think that this adds fuel to the fire. How much fuel can you really add to this? I think that Favre with the Vikings is enough to make all other things sound insignificant.
Next to that, he states what everyone knows and has been saying all along. Brett's not carrying that team. He still has a lousy pass-blocking O-line and mediocre receivers. That team is about Peterson and Taylor. Just look at last weeks game. Favre was great on that last drive, but just ok before that. No harm done here, if you as me.