Trade for D. Johnson

I have an opportunity to trade for D. Johnson (I know he’s hurt). I’m in a 14 team Dynasty 1/2 PPR Auction league ($280 cap). DJ is $21 and can kept for $30 next year . I have Gordon, Gurley, and Crowell. I offered Crowell but he wants Galladay ($6) too. Is that too much?

P.S RBs go for outrageous amounts (Bell waa $101)