I found a little bit about him by googling on mangareader…. quote from Aohige 
Reading the two editors (Takeru Isaka and Hattori Jean-Baptiste - Akira) interview couple of interesting notes
- Both editors testify they get scolded by Oda sometimes.
- Apparently when an editor is assigned to Oda, one of the first thing they experience is Oda telling them all the major secrets of One Piece, up to and incluing the end. (!!!)
….... QUICK SOMEONE KIDNAP ONE OF THESE EDITORS OR PAST EDITORS!
The editor said as a reader of OP, it's somewhat saddening to learn all the spoilers ahead of time. I can see that.
When asked what sucks about being editors, they both testified Oda's obsessive perfectionist attitude getting in the way of deadline lol.
Apparently just the other day, Oda missed the deadline and it was hell getting the chapter in time. Oda's attitude is "The chapter is done when it's done".
As for editoral inputs, Oda mostly uses the editors as "first readers to read his work". He observe the reaction of the editors as a measure of how the readers would react. They testify they don't contibute much to Oda's work, since neither of them have anywhere near the talent Oda has, and it's sometimes painful that they can only stand by and wait, unable to help, when deadline is pressing.
Hattori says the most memorable scene of OP (for the chapters he was editing) was Sabo's comment about ashamed of his birth as a noble, and Dragon's shocked reaction to have such a young child come to that conclusion. It really drove home how talented a story writer he is.