Inspector says: “The toilet-vent must be upstream of the toilet.”

[fidodie]

yeah! alot of good learning

[hj]

What you have is perfectly okay, and that is why he approved it. As for "See if He will allow a low heel 90 and vent up into the wall behind the toilet", most inspectors will reject that because material WILL splash into the 2" opening and could clog it.