First off, congrats on your win. Second, there are a couple reasons why they weren't able to beat you even though they have more power.

#1: You had the barrier against the Obito/Minato team so that allowed you to hit harder than him because of the synergy between Chojuro, Mei and Ao. Ao and Mei's CC would be a contributing factor as well because you stop them from myst or immobile them so they can't attack, and Chojuro has a top 5 attack statistic

#2: That water team was set up HORRIBLY with tenten in front like that taking all the hits. Also, having Mei in m4 is a terrible idea as well because it should be really easy for you to interrupt.

Once the server matures further water teams are going to become a huge problem. I used to be a fire main and fire was neutered and water took over everything, cancer teams everywhere and it *s the life out of the fun. Just a fair warning there.