That's awesome! Only thought I had is that it'll make things even more complicated, so maybe introduce them starting silver league? For regular players, it shouldn't take more than a few days to fully adjust, but for newer players (and some older that aren't as active) another complication of gameplay could not give them the feeling of more depth and variety, but overwhelming and frustration.
Besides that, awesome concept! Thank you for the detailed explanation!
Glad that you like the concept. And yes, I agree with you. In fact, that was already part of my consideration. In the balancing section on the post, I wrote this :
Lol in my mind it started with Wood 0 and bronze 1 😅 my apologies then! Didn't read carefully enough.