I took note of some of the things listed that a bountou can obtain after sucking souls, to be honest the system is well known and used although I do find it a bit odd at how many souls are required to be eaten regardless of the soul in question. This is like saying that the power obtained after eating a captain is the same as eating an unseated officer, and this seems a bit off to me. I shall include a table like item in this post with what I think would be an appropriate system for how powers are obtained and I hope it is taken seriously by our trusted staffers.
Eat an Elite's Soul (ex. captain, espada, ascended super human...) = obtain one available power for that race
Eat two Semi elite (ex. Lt, fraccion...) = Obtain one available power
this would continue on for the differing ranks of characters. Also I know what Bitto do in the canon but if you could be more specific for the empowerment it gives on this site it would be appreciated.
~thank you all for reading my suggestion