I sent a screenshot to my guild this week of levels 9, 10, and 11 being Shade/barbs. Needless to say I did not win that tower (I actually just gave up at 9 because they wiped my only team that can fight shade barbs due to earlier chip damage), and my guildies are struggling with similar issues.
Today I won my tower because there was only 1 barb lineup, and it did not contain shade. I actually won the tower with only deaths to Agnons.
PVP these days is *ridiculously* polarized with some teams being orders of magnitude stronger than others, and the tower these days is more or less "how many barbs do I have today?". There's a pretty basic fix to this too:
Don't allow repeat teams in the tower. In any given day, you can only have a single shade/barb team, only a single full barb, and only a single GT barb (and onlt a single GT lilly, tho that isn't the problem it used to be), etc.
This way you never run in to towers that, because of bad luck, literally nobody can complete it.