I suggest adding a rule to main with the starting hero.

I've thought about this. There used to be a tournament on Battle.net called "Mad Races" that used a similar formula – one main hero for the entire tournament; I was actually inspired by that when creating the gameplay rules.

But there were only 16 participants there, and there were enough viable main heroes for everyone, whereas here there are 60+ participants.

And the rule "main with the starter" needs to be clarified somehow to distinguish a main from support heroes. And preferably at the software level. For example, in "Mad Races," there seemed to be a ban on leveling up any hero above level 10 except for the starting hero.

But in general, yes, due to the ban on the Knight and the Cloak, the number of viable starting heroes increases significantly, thanks to the variety of mages.