You get that koka is essential for him to neutralize those weaknesses? He explicitly states and that goes directly at guys like you, that you cannot just "outmatch" him with his supposed weaknesses, as he even calls his move "fire proof forest" and is prepared for that.
If someone uses fire, it just forces him to adapt accordingly, but it does not mean that Momo is not getting ridiculed, when he adapts to it.
The fight is narrated on basis of Momo's development and the aim was to get in that final boro breath, coincidentally right before Shanks gave out the warning shot so they get that "we can defend Wano on ourselves, juppie"- moment.
In the meantine Aramaki already had the rest low diffed and at his mercy.
Yamato, the strongest one out of that group, was even in to call for help lol
After Momo would have gotten his moment, Aramaki would have proceeded to neg them, Momo included. Shanks obviousl saved their asses.
What is there to argue? And again, he showed like what? 1/8 of his actual arsenal?
Think ndule, think