Ekeler for Amari Cooper?

0.5 PPR 12 man league

My team:
QB: Rivers
WR: Diggs, Tate, Sutton, Watkins, Allison, Fitzgerald
RB: Gurly, Mixon, L. Murray, A. Ekeler
TE: OJ Howard

His team:
QB: Goff
WR: Kupp, Cooper, D. Jackson, T. Smith, Robinson, DJ Moore
RB: Melvin Gordon, I. Smith, Mack

He really wants Ekeler but I feel like Cooper for Ekeler is not a good deal.

What do you guys think? What would be a good counter?