Look at the two most successful AD's over the last 25 years; Jeremy Foley and Tom Jurich. What hiring experience did Jeremy Foley have before he was promoted from the same position that Scot Dolson was recently promoted from? How many years experience did he have at another university? How many other P5 schools were beating down his door? It's completely irrelevant to the task?
Tom Jurich was the athletic director at Northern Freaking Arizona before coming to Louisville where he quickly built Louisville into one the premier athletic programs in the country. You think all that experience in Flagstaff AZ was paramount to his success at Louisville? Hiring coaches is about the easiest task an AD is faced with. It ain't rocket science. Hell Fred Glass had zero experience and somehow managed to hire the best college soccer coach in the country, a women's coach in Teri Moen who has the women's program as good as its ever been, and three consecutive phenomenal baseball hires. Tom Allen just won the most games in a season since the early 90s. Not shabby for someone who doesn't know what he's doing. And that doesn't include doubling the revenue generated by the athletic department from his hiring date, many of the projects that Dolson oversaw.
His alumni status helps, I'm not debating that. But it's not like they hired an alumnus off the street without an inkling clue to the working athletic department at Indiana. He's been a part of it for 30 years.