Two things happened since then I'm guessing.
1. He won a Heisman. Which will inflate anyone's value.
2. A bunch more teams jumped into the QB market.
I think I saw a mock have him going 32nd to the Patriots. I expect when next week's mocks come out he'll have jumped into the top 10 with this news. If Gruden continues to make overtures like how Murray made him throw out his QB height rule, he probably jumps into the top 3.
And then some GM that's been told by the owner "you find a QB in this draft or you're out the next day" ships three firsts to the 49ers or Cardinals to jump ahead of the Raiders and then this draft turns into the last 3 drafts where we have a QB going 1, 2, 3.