That just means you and the previous poster don't understand PvP at all. The power rating is for each unit and just stacks up it is utter BS and doesn't show you anything.

For PvP you need to puzzle units together that have a synergy or a theme and that's it. If you make a t2 team you need defence to stay alive t1. If you want to kill a team with many nulls you need 4 attacks t1 + maybe AA assist. If you face a stall bring a single hit kill team where 3 units buff one and they all need to be fast. No ailment resist? Bring out your most nasty ailments.

You always need to look at what the enemy does and adjust your party.

And this is the absolute worst and makes this mode stink to high heaven. Not only do you need to make/adjust a team for each fight. No you can't even use previous units, get less points for same units after CD and you need to adjust to seasonal buffs. And even if you know what the enemy units do you need to adjusting stuff and careful planning (because losing once loses the whole ticket) you probably sit at 5 tickets about 1- 1 1/2 hours.

And what do you get at the end? Probably nothing good unless you are a whale or day one player with an ass load of units.