... Would have have done better to go the traditional route with four-year recruits?
When you are trying to rebuild, it's always a choice - go for a fast fix, with JUCOs, or try the longer term approach with Freshmen. The advantage of the JUCO/Xfer route is that you can get an instant fix. Since you are bringing in upperclassmen, they contribute right away, so in only a couple years there is a dramatic improvement. The downside is that, after only 2-3 years, they are gone again, and you stop seeing progress, and even regress when you start losing them faster than you are bringing in new ones.
Akron is a good example of that - in just two years under Bowden they had remarkable improvement, and went from being one of the worst teams in America, to being middle of the MAC, but then in his third year, the record didn't get any better. Worse, Akron now has massive graduation losses, and so most likely year 4 will be worse than years 2 and 3.
The alternate approach is to try to bring in talented Freshmen, redshirt most of them, and then patiently wait for them to develop into players. Since teams built around Freshmen and Sophomores are rarely very good, the biggest improvement usually comes in years 4-5 when you take this approach. The risk is that you might get fired before you ever get to year 4-5.
As a perfect example of a coach that did it the slow way, look at Dave Clawson. At Fordham he went 0-11, 3-8, 7-4, 10-3, 9-3. Then, at Richmond he again improved the slow way, going 3-8, 9-4, 6-5, and 11-3. At BG it was the same: 7-6, 2-10, 5-7, 8-5, 10-4. In all three situations, year 4 and 5 were always good.
Solich did bring in a few JUCOs in the early years, but not many. Mostly he went the slow road. He had a good year early, anyway, in 2006, but it was an exception. The real, sustainable improvement came 5 years out, in 2009 and beyond, and Ohio has been bowl eligible ever since. To improve from the current down year, he's again taking the slow fix method, focusing mostly on bringing in talented Freshmen.
As a contrast to Bowden, a MAC coach currently taking the other approach is Chuck Martin at Miami. Like Bowden, he started with one of the worst teams in the MAC. Unlike Bowden, he is building it primarily via recruiting Freshmen. He was only 2-10 his first year, and may not be any better this year. Yet, by 2017-18 (if he is still there), Miami will probably be much improved from where they are now.