The combined, virtual supply of Hive lowered down for more then 20M in 30 days (end of august, behinig of september), from around 415M to 395M... the HIVE only supply lowered down even more, 40M in the same period .... 395M to 355M .... 10% ... conversions has a big impact on this .... these days hive supply is growing again becouse hbd to hive conversions ... Burns to null are small share compared to conversions ....
Meanwhile Splinterlands burned 2M hive for creating account.
This is why I find it interesting tracking the supply
But conversions should not really affect the combined supply (other than some funds being invisible for 3 days?)
There might be some interesting data here though, I agree.
Good luck with it. If I can help with HIVE api, let me know.