Of course teaming a medieval hero book with a cold war series did not seem like a logical choice either, other than the fact they fit nicely into one volume.
The fact that WoF 1-7 does not have any Kirby/Ditko/Heck is pretty much the point of including SW 1-5 - so that both volumes would contain some of each [for those of us who like that sort of thing]. I would just rather see these two collected in two slightly bigger volumes than three undersized ones.