Well, I wasn't born yet when Marino was drafted, so I don't think I'd have said much of anything. And when Favre was drafted, I was 5, so not much there either.
Are you capable of coming up with examples of players who aren't currently in the HoF? Because if you're not, then you're basically arguing Allen is going to be a HoFer based on 2 historical examples of incredible outliers. The overwhelming majority of QBs who are inaccurate in college continue to be inaccurate in the pros.