why sabo??
I can't see oda making him go under luffy's command
I see him as the “Oden” type character.
1. He’s been directly parallels with Oden in the flashback
2. He and Oden share a backstory
3. He’s the number two of a separate crew
4. He wants to write a journal based on his adventures
As for why he’d join Luffy, it all depends on what happened in the Reverie. We know Sabo has Luffys vivre card which imo means he has to reunite with Luffy. And since his communications with the revolutionaries is gone he may have no choice but to go to luffy.