Thanks for the diagram, makes it much easier and it does all seem correct in my opinion.
If your quad is not arming the most common cause is the throttle range is not correct. Go to the receiver tab in betaflight and make sure that when your throttle stick is down, that its reading below 1050 (best if you get it to 1000), as I know betaflight will not arm if your throttle is above this (or something close as I cant remember the exact throttle value). To do this you will need to use the sub-trims option on your R/C radio/