i really doubt that . the whole plot is to surprise the enemy . if Kanjuru manages to kidnap him and fly to Onigashima the whole plot would be for nothing
Let me ask you this.... Do you actually think Kanjuro's plot as a traitor will be RESOLVED right after his reveal??? in one fucking chapter???
If so... then I'm sorry to say this... but you're wrong.... Oda will build Kanjuro to be "Kinemon's MAIN OPPONENT this arc"
Kinemon is the closest Retainer who has been with us for the longest.... Oda is going to give him main opponent this arc... And just like for example Kyrus grudge against Diamante... it will slowly build up until the climax of the war... where both finally clash...
Regardless if Kanjuro manages to take Momonosuke... or not... Kanjuro will NOT be cut down next chapter.... and the fact that Kanjuro will 100% escape in my book... because there is noooo way Oda finally reveals the traitor and next chapter he is DOWN.... logically IT NEVER HAPPENED EVVVVVVVVVER IN HISTORY OF ANIME. There has to be a gap,,, a time that separates between the traitor reveal... and for the main characters to put their hands on this traitor...So.. Kanjuro will escape... regardless of whatever manpower we have at the port.. and him escaping MEANS that Kanjuro will inform orochi and Kaido that the alliance is coming....
Thus... it's not a surprise attack ANYMORE....
Also... one more thing... we all are expecting the alliance to be defeated during this FIRST invasion... where their plans against the enemy is not gonna work during this first time... So... why do you think it's impossible for Kanjuro to report about them coming....
Luffy and co and retainers simply will not pay attention to that... and they will proceed to battle regardless if kanjuro reported or not... However... I expect them to make an ENTRY that is opposite to Kanjuro's expectation..
Remember... Kanjuro listened to Kinemon's plan about how to eter Onigashima... so that plan was already doomed to begin with... regardless if Kanjuro escaped now or not...
However... Law/Luffy/Kidd and co all remained under water and all came after the traiter was revealed... So most likely Law has proposed a DIFFERENT way of invasion... that will go against Kanjuro's and Orochi's expectations on how they will invade.
So.. they will still do their surprise attack anyway... and STILL fail at the first time I assume... Because there is no way they will succeed on their first try to take down kaido...