Drop Luck? Start Parker over TY?! Waiver/Start Advice Needed!

.5 PPR 10 Team League. What 3 receivers should I start Week 2?

Brown, Hilton, Parker, Ginn, Golladay

Secondly, I picked up Derek Carr because someone dropped him for Alex Smith (lol). Now, I have Mariota, Carr and Luck. Should I drop Luck or Mariota to pick up any of the following:

Pitt DEF, E Decker, D Moncrief, J Matthews, J Rodgers, C Fleener, J James

(Starting TE: Eifert, Starting DEF: Panthers, Starting RB: Zeke, McCoy)

Thanks all!