If miracle ticket there is he should focus on Sol / light Tsukuyomi. There is no point getting Raph since he's got Eros already. Otherwise yes, Raph + Mordred is a very good combo.
Unfortunately yes, Metatron is fairly weak. She doesn't go well with Shingen and take a lot of damage because of her debuff. Hopefully she will probably be the next awakened kamihime on dmm so, wait and see...