Time for guesses as to who the mysterious third party is. My first guess is a cypher pole unit ... 0 being the only one left with any threat potential. Otherwise, perhaps it is the Capone-like pirates trying to take over their adopted family? He is from the "worst" generation after all, and jimbei hadn't cleared him executing pekoms before he turned traitor.

Good on Brook for copying the glyph, and I'm disappointed Germa really we're being taken for a ride. I half expected them to also be planning a double cross...