Zach picked up the Manziel moniker as a Frosh when his hoppity style of extending plays in he pocket RESEMBLED Manziel's hoppity style.
In reality, there never was much comparison between their games. Not then, & CERTAINLY not now. It's why no one's thought to call him it lately. Except for ol' Cowherd.
It's all just silly. Like over half of Cowherd's takes. He's a contrarian at least half the time as well.