Why does Zac Taylor even use Hubbard there?

[KillerGoose]

Zac explained this in detail after the game.

Quote:He's played fullback in the goal line in 2018. We put him back in there and he's typically on the backside of the run game and the goal line just to work on the backside. So, you have to pick your moment at some point this season to release him and give it a shot. Usually that's going to come pretty wide open; they had two backers leave the game, so they had back up linebackers in there, so we thought it was a good time to call it, catch them sleeping and they covered it really well, and Sam made a heck of a catch.

TL;DR - Element of surprise