So do you suggest that Ambre the card that we can say its an instant win if you are not totaly stupyd get -10 points
And Praxie witch not even has minus point and not even elo band lets say its not a very dangerous card will get -12 point
or Marina witch is a very good card but not that good to get -19 point. or mona witch is not a big dill any more i think -20 Point.
So your idea on making ld's "fair" is to make them useless (but not technically "useless", just with abilities that would benefit noone using a decent deck). Weird...
As for the whole "are leaders fair" debate, I'd suggest looking at hurican/Frozn. When they first came out, everyone said that both those clans were insanely cheap due to their bonus. Then as more cards from their clans came out, we found out that both were shoddy at best and suffered from too many faults to be considered "usable". With leaders, we're still sorta into the first part of this due to the low number of them (10 currently). If they truly want to make leaders "fair" and "playable" without removing them/nerfind them, then they need to add more to balance out their clan as a whole.
Why do you think a maximum for Ambre make it useless? for example a +3 max 7 or 8. 7 or 8 power is a decent power for any card but you will prevent to make a 10/12 Kolos or a 13/6 kalindra and so but help clans with low pow (allstar, Nightmare, Uppers).
Of course if you want to use as an instant win card you are true but just loosers want to play like that and this was the main problem.
I'm not agree because you can make the clans as balanced as you want a courage +3 pow always be a something that you can't balanced.
If you add any other leaders to your deck its make it a little more power full but if you don't use your brain they are useless and they backfired on you. But when you use Ambre you don't have to think to win and most of the times, as an opponent, you can think as many as you want you already loos.
I think its a very big difference between Ambre and the other leaders. And you can't change it with the balancing out all the clane thing.