I think Boykin showed he has skill but there are a lot of mouths to feed in GB and he is low of the totem pole. Hartline has the trust of his QB but that offense isn't explosive.
Boykin - just because an injury or two happen to GB starters, Boykin becomes a WR2, at least, if not a WR1.
Even if the rest of the MIA WRs get injured, you aren't going to get much more out of Hartline than what you already are getting. Just so much more potential with Boykin, even if Hartline is a starter on a lesser offense.
Honestly from what I saw last year, Boykin didnt play great with Rodgers and even with Cobb hurt he was getting his targets late in the games. His td against Cleveland was in the fourth, his yards ramped up in the fourth against the vikings. He developed chemistry with Flynn however as his best games was when Flynn was starting. However he was also in the slot, so that may have been an effect. Cobb being in the slot when healthy may help his value more as a no.2 deep threat. Idk if I would draft him, I'd have to rely on him as a waiver pickup.