This is just what I think so don't be too judgy.
40%: Camilla(NY), Takumi(NY), Azura(NY), Ryoma
20%: [Insert 3 units from Fates that are in the upcoming Tempest Trials Banner], Corrin(NY)
For the three 20% units, I think it's the 3 other royals. Since it's Hoshidan-based seasonals and the final map is Conquest's, it may be either side.