Nobody's saying Bell should go straight to Bama as OC or head coach. But this is how coaching progression works. Bell doesn't have the resume yet to be a big time program OC or head coach. That's why he was a candidate for a first-year FBC job where he had some background and geographical connection. He's a guy you can take a chance on with a struggling FBS program as a coordinator, having familiarity with the team and showing some talent for the position seen inside the program.
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I think people really overrate coaching titles these days. They don't often mean what they sound like. The titles are often a way to get more coaches hired with incentives and keep them around a while as they develop. They are often proxies, guys that may be more instrumental in recruiting, or having some diversity in different ways, not necessarily specialists.
We also see on so many occasions that a top OC or DC can be completely lost as a head coach, and some great head coaches weren't great coordinators. It's really not a good indicator of how a new head coach is going to turn out. It's just a very different job with different skills necessary to be in that particular position and develop into it, and continue to get better at it.
"The only true currency in this bankrupt world is what you share with someone else when you're uncool."