Its not really a secret. Celica has Ragnarok, RA, Moonbow, Distant Def, Renewal 1 and Spur Def 3, Delthea has all her original skill except for having Desperation 2, Xander has Siegfried, Reposition, Ignis, Armoured Blow 3, Vantage 3 and Hone Cavalry and Camilla has Brave Axe +, Swap, Iceberg, Iote's Shield, G Tomebreaker 3 and Goad Fliers. Xander and Camilla still have their buff skills on for Horse and Flier Emblem. Plus bonus characters get stat buffs so Celica and Delthea are stronger
Makes sense I guess, still wish they wouldn't do it so.. I wouldn't say hard but annoying to keep up unless you have a+ teams like that
Also knew I shoulda trained my Delthea lel