Indeed, I asked, but didn't notice right away – my apologies – and you don't always answer my questions on the first try either ;)
I believe that a pair of Dungeon castles, taking into account all the changes, is as close as possible to understanding "balance."
Maybe it is, but the classic Dungeon gameplay is about mines; if you rework other heroes, you'll get Wrath of the Titans gameplay, do you really need that?
A more interesting option is "Miner is good, but there are alternatives." In fact, that's what happened in Wrath of the Titans – in most games, you started with the Miner, but there was an alternative for those who wanted it – Laura.
This is especially useful for mirror matchups – if the Miner is too strong, there will be unpleasant setbacks for the hero, which will make the mirror matchup not very mirrored, as a large and mathematically justified bet can be ruined by a specific situation (too much or too little money).
The optimum for a mirror matchup is a zero bet, when the red bonus is approximately equal to the bonus from a slightly stronger hero for the blue player. To achieve this, each castle should ideally have a second starter, even if weaker than the first, but not by much. Currently, this condition is not met for all castles, which is bad in my opinion, so in the future, some adjustments may be made on this topic.
and you were talking about kindergarten logic... n/c
I've suggested various unconventional prices or quantities several times, but the team has stopped me, saying that it doesn't fit the overall trend, looks awkward, and smells too much like an online game, etc.