Seems kinda weird that Luffy's dream would just be Jinbei's dream but bigger
I've suspected this is dream tbh, he seems kinda obsessed on meat and I doubt its just due to him being Brazilian ofc.
We still don't know Luffys entire past, what happened with his mother and father and who his mother was/is.
I've felt his meat obsession and immense appetite is partially due to a time in his life where he was starving and barely got food.
This would make it all the more significant, poetic, emotional and thus a parallel that he recruited someone like Sanji and thus what happened at WCI too.
This is speculation ofc but it explains why Oda even gives him fire attacks and thus electric ones too, barbecues and electric grills? Lmao. (Mostly joking here)
Zoro uses some food and Japanese named attacks, hence making him similar to Wanos Samurai and Oden ofc too.
I've suspected that not only each Yonko is a reflection of a different side/aspect of Luffys personality but each SH was also recruited because of a personal parallel with Luffys character and life somehow.
Robin may be like one of his parents at least, maybe that's another reason why Oda sent her to Dragon too.
As you said his dream is similar to Jinbeis too and Luffy has gotten so many people, including former enemies to help him. Its obviously due to that dangerous and useful charisma Mihawk mentioned but I also think characters like Crocodile, Moria and Weevil are similar to Luffy in their own, even minor ways at least, whether its formerly similar outlooks in life, being a foil especially of what could go wrong for Luffy or just similar personality aspects/beliefs.
I think Moria and Weevil will become allies in future to Luffy and thus Luffy will have in some form befriended and gotten the help of almost all former Warlords, Blackbeard being the deliberate exception ofc.
This is all speculation though ofc.
Big Mom and Bonney are associated with gluttony too and BM also with starvation but I'm sure Bonney will be too.
This parallels them with Luffys gluttony and Sanjis starvation and hatred of seeing anyone starve, even his enemies and villains. Luffy also had a starvation arc in WCI too. Oda paralleled him with Sanjis mom then too, with the bento.
Kaido and Luffy have been shown to have their own similarities and Luffy has succeeded to be Joyboy unlike Kaido so far.
Luffy I've felt has a foil and parallel in Big Mom and I think for the reasons above, Odas track record anyway and their history with Kuma and what he did for the SHs ultimately, Binney will become a staunch ally of the SHs at the very minimum too.
Also being a kindred spirit in gluttony and potentially history of starvation like Luffy and being converted once she tastes Sanjis cooking too anyway lmfao.
Big Mom doesn't even know Sanji made that replacement, one of a kind in recipe cake that she loved dearly too btw!
Luffy doesn't like to share his meat at all and I think its due to especially unknown personal reasons, when food might have been really scarce to him and he only had the meat he was given by others. A very similar backstory and thus huge parallel to Sanji then too.
Again all speculation ofc. With the weaponry themed attacks he's used, I feel war may have also played a huge role on his past, him being exposed to a lot of violence and thus weaponry and he subconsciously associates himself with it.
That's why his father is the leader of the Revolutionaries too potentially, what may have happened to his mother and why Dragon isn't a Marine like Garp too. Part of the reason at least ofc.
Nami was found in a war torn country by a Marine called Belle-mere too. Interesting potential parallel to Luffy there too somewhat?
The SHs all seem to have adoptive parental figures or even stepped up as parental figures/carers/guardians themselves too.
I also strongly believe for the reasons above, Yamato WILL join the SHs, including being starved, similarities to Luffy and even Oden who is kinda like Luffy too and other reasons.
For a final time though, all speculation by me ofc.
I know there's probably a ton of stretching here at least ofc but some of it was deliberate too at least.