>>530572393
Centur-Ion's cover card wasn't even their boss, it was Emeth VI.
>Centurion is an entire archetype where their own bosses are just extenders.
Because Centur-Ion as a deck concept is meant to be setting up Synchro Summons during the opponent's turn and outgrinding them with the big bodies.
It's why Legatia pops on summon, you are meant to summon it during the opponent's turn as interruption.
You are meant to go into Auxila first, to set up and provide protection so that you can then go to Legatia on the opponent's turn. The only problem is a single pop is dogshit and you are much better off going for Crimson Dragon into Blazar plays.

>>530572871
Cover cards aren't always bosses.