What is Mattison worth for me? (Dalvin Cook owner)

I am a Dalvin Cook owner and currently 1-2 in full PPR. I was offered Alexander Mattison and Dalton Schultz for my TE Mike Gesicki. I also have Jared Cook on the bench (currently questionable). Should I lock up my handcuff? I am a little worried Gesicki could be a breakout this year.