I know this is not much to go on as i have no evidence but i was just thinking and i want to let out my thoughts on this thread.
Zoro , Kanjurou and Kinnemon side
In reference to Zoro's dialogue in the recent chapter:
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He mentions that hacking away at birdcage alone isn't effective but it may be if those two help him. Now lets think about it.
Zoro = Heaps strong attacks (includes air slashes)
Kinnemon = Firey style attacks, pretty strong
Kanjourou = Havent seen much from him except his devil fruit ( which is pretty convenient lol he can draw anything and it comes alive!!)
1. Now like if Kanjourou drew a substance/item that is known to deteriorate or dull strings.
2. Kinnemon can then on the same spot use his strongest fiery attack
3. Zoro then uses a 3 sword style attack, and a small part of birdcage breaks. Like two strings even would be enough.
Then all the citizens, pirates, and everyone can go outside and be safe. But that leaves Luffy, Doffy is hunting him down...and his still needs time to recover so i dunno. Nevertheless, i believe the breaking through birdcage will happen as was seen in marineford:
"Garp: they saw a little gap in the wall and came right through hahahah"
YOUR THOUGHTS ON THIS SUUUUPER WONDERFUL THEORY OF MINE AHA?