Do we even know how WB joined Rocks? It is heavily implied that Rocks gained a lot of crew members via Davy Back fights. Do you think WB would have a choice at that point?
Again, you keep ignoring that we know that BM was already a pirate captain
Doesn't disprove that WB was already a pirate captain, we don't know how he joined.
Ironic considering everything I've pointed out is from the canon and the only canon material you added doesn't disprove these characters already had crews lol
"gathering new members" for a reason