I agree with you. There's just one thing that bothers me about Rush, his floaters. He throws floaters all the time. There's too much air under every pass he throws and it's obvious. It bit him against the Eagles, and I'm not even talking about the interceptions. There were a few passes around 12-15 yards that were knocked away at the last second. Those would be completions by any other QB in the league that throws it on a line.
I realize everything you said is more important than arm strength. But Rush's arm strength, IMO, is at an unacceptable level for an NFL QB. But regardless of who is at QB, the Cowboys are less successful when the QBs have to throw more passes. Rush threw the most, 38 against the Eagles. Dak with his highest of 46 against the Packers.