Again, those two new KMF are
not from the Akito OVA but from the other new manga/photo novel project.
I'd like it if those two characters and their mecha showed up in Akito, in principle, but right now that's not a proven assumption at all.
I don't think either will play the role of main antagonist. The idea seems to be making them mutual rivals and telling their stories in printed -not animated- form.