Interesting that this FB skips around. It seems to stop when he's 15 and joins Rocks. Then it skips entirely to the rest of the conversation he has with King about Joyboy.
The 2 biggest things still missing are:
- Rocks
- Yamato/formation of his crew (if important)
I assume the former now (if not addressed soon) is going to be a major plot for Shanks/Blackbeard, so it makes sense why it's skipped. The later though can totally be shown if Yamato is a crew member and joins. I can imagine this is why the FB is pretty short at least (unless it continues next week)