Alshon's Value - Keeper question

I’m in a 10-man PPR Superflex league. I’m lucky enough to keep ol’ Kamario for free. I’m in the process of figuring out my second keeper and I have the opportunity for the following deal:

trade a contract year (we get 5 a year to begin with and I’m putting 3 years on Kamario) and a 5th rnd pick for Alshon and a 6th round.

That would put my picks at 1.6, 2.8, 2.10, 6.4, 6.5, 6.8, etc with Kamara and Alshon as my keepers.

Should I keep my 5th round and hope for a better receiver or go ahead and do the trade?