Trade Help! 6-2 but RBs are weak

Should I trade John Brown for Matt Brieda + Small Piece? Full PPR. We start 2 flex players. Im 6-2 and feel like I cant rely on Doug Martin as my RB 2. Is losing John Brown in my flex worth getting a RB like Brieda?

My Roster:
Zeke, Doug Martin, Carlos Hyde, Corey Clement

Odell, AJ Green, Larry Fitz, Geronimo Allison, Tre"Quan Smith