That would be extremely badass and awesome. Loki feels more like the son of Xebec. Blackbeard thinks he's the rightful heir and he is by blood, but as Whitebeard said to him as a close subordinate of Xebec for years, "you're not him" ofc.
Man I'd love that. Eris being Mosa to use Loki as the ultimate revenge plan and carry on Xebec's will and legacy. That is so fucking badass indeed.