It wouldn't actually make sense for the "Deacon" to appear anyway, given that it was the product of a rather convoluted and improbable life cycle. Although the original design was intended to be a proto-"Xeno" of sorts when Prometheus was still an "Alien" prequel, as actually employed in Prometheus it was an abomination, essentially - included to reference "Alien" whilst maintaining the distance from the original creature design that Scott (for whatever reason) wanted.
Unless the one and only Deacon specimen hitch-hikes its way off LV-whatever-we're-calling-it-this-draft, I don't think we'll see it again.