2019 Auction league - I can keep two

I can keep 2 of the following at the listed cost ($10 is the minimum keeper cost in this league, and the price goes up each year)

Nick Chubb - $10 (I think this is the no brainer)
Kerryon Johnson - $12
Derrius Guice - $10
Tyler Boyd - $10

Guice and Kerryon both have question marks, and Boyd is a WR2/3 so he’s not as good of a value, so I keep going back and forth.

I lean Chubb and Kerryon. Kerryon is worth the extra $2 in my opinion.