Regarding Mallett, I have not been to TC yet this year, but in August 2013, it was instructive to watch Brady (elite) followed by Mallett (competent), followed by Tebow (not even close.) The reports this year are better on both Mallett's development and Garoppolo in comparison to Tebow. Garoppolo has a long, long way to go, but at least he can make the throws.
My feeling then, as now, was that Mallett would be capable of managing a game, and possibly being a good fill-in if he got enough reps and developed some chemistry with the first-team. Last year with Mallett would have been awful with that group of receivers blowing assignments and dropping balls. This year is more reassuring.
Personally, I'm thrilled to hear that outsiders like Mayock who travel around to different camps see Mallett as a legitimate NFL QB. We're certainly not objective enough to judge Mallett since everything is through the lens of Brady comparisons.