The mentioned card hasn't even released yet, so we won't know for sure, really. Its no use comparing casual deck eith META while blue eyes mentioned support card hasn't even released yet
Maybe its because the game hasn't change the text yet, and we don't know for sure what kind of rule they will finalize this skill.
And the polymerization condition to be activated seems require 2 copy of blue eyes RIGHT AFTER you start your turn, which mean if you add it manually, you have to wait a turn before be able to activate the skill.