@Count:
We have a character desperate to learn what happened to her missing family on her fifth birthday, a character that can manipulate memories, a character who was a witness to what happened on Big Mom's birthday, and a character who is linked to the organization Carmel dealt with (Stussy/CP0). Also, Pudding's memory powers have been completely irrelevant throughout this entire arc outside of the erasing Reiju's memories in their introduction. Meaning that if she doesn't use them again o Streussen, her powers were a complete waste of time and potential. I very much doubt that Oda aligned all of these pieces coincidentally instead of them leading to a big payoff.
I'm aware of all this. I'm just having a hard time understanding how exactly Streussen is supposed to make a comeback when it's explicitly mentioned that he is down for the count, as well as everyone being far away from him, with no reason to check up on him anytime soon, much less invade his memories. Saying essentially "Don't worry, it'll happen somehow" is not exactly comforting, don't really have a response for that. As for Stussy, I also don't see why she'd blab about anything, much less someone randomly asking her anything that would lead to her revealing that information. Assuming she's still around of course.
I do agree with you however that it'd be very weird for Pudding's powers to not lead to some big moment in this arc, I'm just, again, struggling to see why she'd suddenly use it on Streussen where's there no need for her to. Some people also suggest she'll use them on Big Mom instead. Maybe that's also quite unlikely, but probably less so than her grabbing Streussen's memories at this point in time.
Why would all of that be delayed to Elbaf when Big Mom's flashback is being made relevant in this arc?
Beats me, just food for thought. I'm very interested however in seeing if there's something more important there regarding the eventual trip (or they just stumble across it) to Elbaf. Like maybe there's a Red Poneglyph there for example.
And my big issue is that I don't see Luffy ever fighting Big Mom after this arc. I'm even skeptical of her even returning in Elbaf. Lola's wedding might be important there, but nothing else about Big Mom is. If Luffy can't defeat Big Mom physically, then he has to crush her dreams in some other way. Big Mom learning about what happened to Carmel and how Carmel is a fraud crushes her dreams. Thus fulfilling the quota of crushing villain's dreams that Oda has stated Luffy must do as a protagonist.
And I still expect the Straw Hats and Charlotte Family to teamup to serve Big Mom a cake. Pudding has to get outed for working with the Straw Hats. And it would be way too weird for the Big Mom Pirates to let the Straw Hats serve Big Mom cake and then go right back to hunting them down.
I hear ya, I just ultimately feel that we're in somewhat uncharted territories here since it involves a Yonko, regarding how swift the "crushing" will take place.
As for it being weird, I was under the impression that as soon as Big Mom spots the cake, uhh, she's not exactly going to wait for permission. The BM Pirates don't have to let them do anything.