Zach's a more cautious runner than Manziel, but I wouldn't say he's all that inferior to Manziel on his feet. Truth is, if Manziel had half the arm of Zach, he woulda risked running a lot less than he did.
I think what really got Wilson the Manziel nickname was his jumping around in the pocket his Frosh season. That was a bit of an iconic thing about Manziel — that Wilson used to do in a similar fashion.