Yeah look I agree in part. Names like Hohns, Benaud and Sawle do show it can be done. So I'm not saying Invers will be a failure, just that with the professionalism of the game and the fact you could be telling a guy who was on a $million a year that he'd now unemployed that every little bit of cred is valuable.
I do believe that the step up from FC to Test level is huge and so if you haven't actually lived it for a long time it would be hard to appreciate (but then what would I know eh?) so having that experience would be very valuable. But in the end the selectors job is to put a winning team on the paddock so all the qualities you've mentioned are front and centre. So long as the team is winning and a credible group of replacements are available then the selectors will look like geniuses. I'd just like to add a couple more qualities and experience if possible.