Oda refuses to kill any friend or ally of the Straw Hats outside of flashbacks with only too few exceptions.
- Whitebeard
- Ace
- Yasue
Thats pretty much it. Pell, Pagaya, Franky Family/Oimo/Kaashi/Shipwrights, Pound, Peckoms, Pedro, Vergo and Monet all have "died" offscreen or in an explosion. As we know, everyone there save for Peckoms, Pedro, Vergo and Monet have been confirmed to live. Peckoms is likely alive due and I wouldn't be surprised if he's on the ship with Pound (he has history with Bege) considering they both were on the same island. Monet and Vergo are likely dead since their arcs ended forever ago and are irrelevant now, though who knows. Pedro is still up in the air until this arc finishes.
I like to think that Yamato is a foil to Momonosuke, with both of them being kids and considered by many to be unworthy heirs of their fathers but in different ways. Momo because he isn't prodigy like Oden was while Yamato may be as strong as his father was as a child and so very promising but without his father's cruelty, ambition and martial mind.
That would make it even more interesting if they become friends.
That would make it even more interesting if they become friends.