servo identification

I just bought a goblin 380, new newer been used. Tail has mks 9780, but the seller couldn't remember for the cycle servos. Not a big deal, still worth the money, but I don't want to use a crap. I only had today, 4min "maiden flight, no issues at all. Weather was very bad. Thanks ...

I'm a bit confused about receivers and the servo's they control. There are ports on the receiver for ELE, AIL, and RUD as well as AUX1 controlling pitch. What confuses me is pitch needs to control all three servo's, aileron needs to control two, and elevator one. If you take things apart and...