We already see Hydaelyn 'playing favourites'. Her power is limited, yes, but she goes out of her way to protect the WoL and presumably the major Scions such as Minfilia...but most of the regular Scions perished during Livia's attack. Hydaelyn didn't intervene then - and if she did protect Minfilia and her gang somehow during that time then realistically the 'regular' Scions should be pretty uncomfortable if that is revealed.