Valkyria Chronicles 3 OVA OP

Spoilers!:
I'm sad that Margit nor Giselle got a part in the OVA :( It looks like Gusurg's betrayal already took place since Carrisa is the tank driver, but strange that he wasn't with the Calamity Raven in the intro.
Largo gets a direct part in the intro but not Welkin!? (Yes, I know he's supposed to be in the Edelweiss but still.) I'm also sad that the VC2 cast did not show up in the intro (well not so much as Avan and his friends, but more like Leon and Baldren).
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