Are you sure???
I suggest that if you put 5 bassists in a room you'd get at least 6 opinions. "Who is the best bassist" often leads to near fisticuffs - what I like doesn't translate to what you, or anybody else, likes. "My dog doesn't like slap" - though whimsical - shows how we are divided on taste and style.
You may have to pick a genre each week and consider the bassists who made significant impact in that genre...