You should notice they had to set up a Gatling Gun, during a total war they dont have that opportunity
And in the statement, Germa are not facing enraged army.
Finally the gatling gun was useless as they destroyed it
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Big Mom Pirates have Higher Numbers of Soldiers & also More Officers
Sweet Commanders are indeed comparable to Calamities but in a War, they are more Troublesome
Katakuri have Future Sight which can Help Stop a lot of Alliance Plans & Surprise Attacks, not to mention that Numbers are useless against him & the Strongest Members of Alliance are needed to keep him occupied
Cracker can create Infinite Amount of Soldiers who are really Strong & due to his Haki, not anyone can Stop them, so again Strongest Members of Alliance must take care of them, otherwise the Alliance Soldiers will be Overwhelmed
Another problem is Mont d'Or & Brulee & also Pudding's DF Abilities which can truly ruin Enemy's Formations & create Counter Surprise Formations. Not to mention that O-Tama cannot help in Whole Cake Island
Beasts Pirates were also attacked when they were Drunk & out of Formation, something that BMP doesn't suffer from during Tea Party.
Also they are gathered on Top of Whole Cake Chateau, so sneaking in will be much more difficult, especially that only Charlotte Family & certain Invitees are allowed inside the Party, meaning Alliance cannot have that Surprise Attack they managed to do in Onigashima.
Finally, Big Mom can easily hide the Moon by changing Climate & massively Nerf entire Mink Army
It's pretty clear that they are going to win in Onigashima mostly due to Luck even with all those Advantages.
Invading WCI is much much more Difficult with those Advantages gone & Charlotte Family having more Troublesome Abilities & Preparations. Imo Wano Alliance cannot Defeat BM Pirates (Realistically ofc, not taking Luck & Story into consideration)
You forgot something in your analysis : Law is a far better strategist than Capone
Your argument is base of BMP facing half SH crew
Just look at Cocoa Island
- Pre-war : Nami outshined the whole BM navy on Sea with a damaged Sunny
- During the war : BMP had hard times against Germa basic clone in naval war and even got their ships invaded and turned into battlefield
- 4 Vinsmoke were enough to keep the Whole Vinsmoke Pirates who were on land harmless until the SH leave
All of them were greatly relieved when Big Mom joined the war, and if you had the panel below it's highly implied that fishmen and Germa won the naval war when the SH left
Inside your argument, you considered BMP having to face less than 20 individuals
When we're talking here about far more people (Germa clones and Minks included)