Over the years, these bikes didn't always have a R/W running into and out of the kill switch. Sometimes it was a brown in and out to the coils, other times it was a brown in and a R/W out. What the diagram shows may not be what you find on the bike. Points coil wires are another discrepancy. Every points coil I've ever seen has a brown and orange wire. The diagrams often show the orange as a gray for the right cylinder coil. Granted, the gray points wire does connect there, but the coil wire it connects to isn't gray, it's orange.
In the starter lever/switch assembly pic you've shown, I'd say the brown is power in from the ignition switch to the kill switch. R/W is power out of the kill switch to the coils. The blue/white is the start lever wire, from the solenoid. It grounds out probably to the bars then into the headlight when you pull the start lever.
