Even bigger obstacle now actually! The King of Ruilandt, the sketchy kingdom Zeno works with who are obsessed with the legend of the Holy Bride, confronts Alec during the Foundation Day Festival with the implication that he knows about Loneal being the new Holy Bride.
Zeno's behaviour in that chapter also kind of implies he might know Loneal's not from this world, or at least that he lost most of his memories?

I feel like we're reaching the final arcs now since there's really only 1 obstacle in front of them (zeno)
now I feel like I wanna reread everything again kinda missing our favorite twink loneal