The thing AEW is doing well is presenting new stars. We all know how WCW kept dropping the ball when it came to elevating new guys. WWE brings in new people, but they only get so high before they plateau.
The segment with Cody going after Jericho was Heel 101.
I DARE YOU TO CROSS THAT LINE
*crosses line*
OK... I DARE YOU TO CROSS THAT LINE
Regarding Marko, I think he did as great as could be expected. The gimmick with Jungle Boy and Luchasaurus is "the boy and his friendly monster". Marko is the third part of the act. Unfortunately Luchasaurus got hurt, so Marko was the replacement that made the most sense.
In the end, they still lost. I think The Bucks taking Canadian Destroyers off ladders do far more damage to the business than a small guy kicking out of a double team move.