User blog comment:B214/General Discussion/@comment-4547267-20161206203653/@comment-9595671-20161208094229

Except they both share a trait in common, both Asia's dragons and familiars can be summoned. Therefore a summon would pretty much be treated ike a familiar.

I think this is the very reason Gogmagog and Fenrir are actually in Vali's team as his peerage and not Le Fay's summons, they couldn't be used otherwise.