Sam-Jack-Dunn, what you said about the 2 embryos in every host thing, i dont believe this to be entirely true, i really thought that the only reason more than one burster came out was because the host was pregnant, i only saw women be impregnated, and more than one embryo could have been set in to imprgnate the babies.
also, Red, About the Army destroying the predalien, i kinda doubt they would do it that easily without dropping a nuke. as a big squad was taken out by a few sneak attacks from aliens, i dont even remember if the predalien was in the fight itself, but they were still taken out.
In my opinion the original Queen would be much more of a threat. With the way the hive took out an entire colony in Aliens, and had such a large amount of strategic and ruthless xenos, with hundres of eggs still sitting in the chamber. The queen owns against the Predalien (queen or not) in my opinion.