Originally Posted by
FuryUs1
We were posting at the same time, so my post wasn't directed at you. Your shifters and cassette match, so as long as your derailleur has the correct pull ratio, it doesn't have 'speeds'--it's just the go-between. Shifters and cassette different speeds is a different scenario than what you have.
I think we were posting at the same time again.

Basically, you can disregard everything I said above, I didn't read the original post carefully enough.
I thought the OP was concerned that a ten speed cassette, ten speed road shifter, and "nine speed" RD would not work together.