As mentioned before-- How do we even know that Ryan was talking to David? He could have been on the phone with someone else. Not likely, but possible.....
Ryan got the job. Who else has an MBA?
Exactly. This isn't Unsolved Mysteries. It's a comedy.
Not sure why anyone would still doubt this, but just in case I ran across this from the BJnovak myspace page:
"We are already hard at work writing the next season, which will be a very exciting one. Especially for Ryan, of course, who has risen quickly from temp to sexually-harassed salesman... to Michael's boss."
It was hilarious to see their toons do the emotes in conjunction with what they were saying. Butters walking up in-game with the same character as Cartman made me lose it. Just the way Cartman's dwarf looks over Butters.