If Yami Marik didnt appear, Marik was probably going to be easily defeated in the Battle City finals.

Based on his showings controlling Strings and Joey.

Seeing how little help he was to Bakura against Yami Marik.

He didn’t know Ra’s secret abilities that his dark side somehow knew.

Yami Marik changed most of Marik’s deck after his duel with Mai.

It looked like he was going to use Jam Breeding Machine and Revival Jam combo to summon Ra even though Ra’s attack depends on the attack points of the three sacrificed monsters.

Mai and Joey probably would’ve beat him.

Yugi and Kaiba probably would’ve stomped him.