I don't think there's any way to know whether the Negro Leagues will add 1-2 players in the next 20 years, or add 10-20 players. Even if it is the latter, it is not obvious who those players will be. The names you mention (Brewer, Allen and Trouppe) are all possibilities, but there are so many players whose stories are being uncovered that there's no way to know. Donaldson, Redding, Malarcher, Vic Harris, Gus Greenlee, Dizzy Dismukes etc. So many names that have a legit shot if the voters (and those who decide what will be voted on) decide to view the Negro Leagues as a parallel league and assume there should be a similar number of inductees. (FWIW, this doesn't seem to have happened.)
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