I like that part
But why do you think yorki was killed? Wasn't he ill??
Yes, but He left Crew & tried to leave from Calm Belt
So He was assumed Dead either from Sickness or Sea Kings
I believe that New Samurai saved him & They became Friends & then Yorki started a New Life (Or simply sailed again)
It should be noted that He is inspired from Calico Jack who did stop being a Pirate once but then returned after meeting Ann Bonney
(It's highly possible that Imu's True Name is Ann)
Regardless of how that Flashback will go, New Samurai eventually went to meet Crocus & Laboon after hearing about them from Yorki, hence why both were Happy to meet him & hear that Yorki is Alive
However, what all of them don't know is that Yorki eventually was targeted by Holy Knight(s), who not only ended up killing him, but also took his Clothes (At least his Hat). As for the reason Oda made that Yorki's Friend a Samurai is cuz He intends for Brook to use that Samurai's Sword in his Fight against that Holy Knight