I agree that Pierre is probably overkill on this team. But I'm not sure how viable Zumaya is as a keeper in a league where you keep 8. Are those your only options? And is this H2H or Roto? Might want to hold onto Pierre and then try and move him in a trade.
Zumaya will probably not close this year and it doesn't look like he's going to the rotation. He still has a lot of value as an MR, more so in Roto leagues, but you don't want to spend an 8th round pick on an MR. Or at least I don't.