Sometimes the readers on this site are so disappointing. I wonder how Oda would feel if he read threads like these. While Smoothie "doing nothing" may at first seem jarring, it's not really so much so when you step back and look at the bigger picture. Despite the fact that it's been numerous chapters since this all started, not that much time has actually passed in terms of in-universe, in-manga. The window to hurt Big Mom was only five seconds after all.
In an extremely short window of time, a ton of people have come out of the woodwork. They've thrown the party into chaos, destroyed the cake, and Mama is in a frenzy. There are all the Luffy copies running about causing utter confusion, Pudding's break down, and Sanji being more capable than they initially expected with him dodging the shots aimed at him. All of this happening in a relatively short period of time. The fact that so many chapters have passed and we're only now getting into Big Mom's scream is meant to show how condensed all this chaos has been time-wise.
The only person that has been acting so far has been Katakuri because he can catch glimpses of the future. While everyone is still trying to put the whole picture together, including Big Mom herself, Katakuri has a wider glimpse than everyone else. And even then, he's failed at every single turn. It's by itself pretty stupid to be asking why others like Smoothie aren't doing anything in this super chaotic and confusing situation when the guy with the clearest picture is having a hard time keeping up with everything. Shooting Sanji, intercepting Luffy, stopping the picture from being smashed, nothing has gone Katakuri's way.
While Katakuri has known about the picture plot since a few chapters ago, it's only this chapter that the others have seen that picture(no pun intended)(a picture Katakuri had the benefit of seeing a while ago, which is why he could TRY to act before everyone else has). The problem now, however, arises with the fact that while people like Smoothie now understand what's happening as well as Katakuri did when it all started thanks to his foresight, is that Big Mom's scream is happening. Smoothie CAN'T act because now that she understands what's happening, she has no choice but to protect herself against Big Mom's scream, hence why she called for someone closer to Luffy to do something.
It's rather unfair/nonsensical to keep asking "ERMAHGAWD, WHY ISN'T SMOOTHIE ACTING PROPERLY, KATAKURI IS TRYING" when
1. Smoothie only JUST got the information needed for her to act like Katakuri is, and has to focus on not being knocked out by Mama's scream
2. Katakuri got that information EARLY thanks to his foresight and STILL has ****ed up with his attempts.
There's also the fact that Big Mom has an unspoken rule of "KEEP OUT OF MY WAY BECAUSE THAT'S AN INSULT TO MY STRENGTH" going, which is probably why someone like Smoothie is keeping her distance so far
Katakuri and Smoothie have better portrayal. Even if they aren't stronger than Cracker (unlikely), they should still at least be at his level.
lmaooo she hasn't had any portrayal that says she's stronger than Cracker.
