The question everyone's asking about Tebow -- 'has Tebow shown anything to prove he belongs on the team' -- should be asked about Mallett too. Honestly, from his preseason appearances, the answer is no. I'm really not confident in either backup QB at all, and I was a Mallett fan when they drafted him.
I actually like what I'm seeing out of Mallett more today. Accuracy issues are one thing but I feel like he's making better decisions which matters to me more.