Comments of chapter undefined of Bleach Seireitei's Discipline Captain

Not true, there are 3 ways to be eligible for a Captain seat. 1- Mastering Bankai, 2- Being the Selected Successor of one of the noble families in their respective divisions (they usually reach Bankai anyway before ascending), and 3- Defeating the Captain in a fight. It is just that for numbers 1 and 2 the Captain also requires votes from other division captains.