Austin had to go, but both Joseph and Whipple could have gone anywhere. If Frost could sell those 2 into coming to Lincoln, he could have sold a different OL coach if he wanted.
A good quote by Hiestand to give some background on what to expect from Raiola in terms of philosophy (unfortunately, this is what Austin didn't bring to this team, IMO)
und.com
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On his success of developing offensive lineman and making them NFL ready
“I think it is the fundamental approach to the game. We are going to constantly challenge our guys to be sound in technique and fundamentals. We are not going to be so consumed in scheme and who we are blocking, but rather how we are blocking them is always part of the equation. It is critical that they know what to do, how to do it and then do it in a tough, physical and aggressive way. We instill that by our drills. We instill it every day when you come into the building by doing it as hard as you can do it with focus and intensity. We are going to be a physically and mentally tough group, play in and play out, but that’s going to be developed on a daily basis. It will always be part of what we do. It’s not just going to be about, `You’ve got the five technique, you’ve got the nose guard.’ Rather, it is how you got the five and how you got the nose guard. It is where you are putting your pads. It’s getting underneath people, running them off the football, staying after them and continually emphasizing that every day.”