Personally, I don't think you can compare NCAA and NFL coaches on the same top 10 list. Sure, Knute Rockne compiled a ridiculous win/loss record, but that was back when Notre Dame was the gold-standard, and they had literally ALL the talent. Well, not all, but today a lot of the primo-recruits go to other major schools; back then, over half of those went to Notre Dame instead.
Also, a lot of these major college programs play Western Pennsylvnania Technical Institute of Interior Design every year...a lot of gimme games. In the NFL, there are no gimme games. At all. Every once in awhile an Appalaichain State will pull an upset over a Michigan, but it don't happen often.
That being said, I personally would instantly remove all college-only coaches from the top-10 list. Especially Joe Paterno, because his name should be stricken from everything for his role in Sanduskygate, in my humble opinion.
Bill Belicheat in front of Gibbs is insult enough, but Bill Belicheat in over Walsh? As Goaldie said, Walsh invented the offense that has made a lot of careers. His coaching tree is unrivaled in the NFL, and leaving him off in favor of a college coach or Bill Belicheat pretty much invalidates the rest of the list.
Don Shula is on the list for his undefeated season, that's it. He couldn't win a superbowl with a top 5 QB of all time! Get the eff off a top 10 list! That's ridiculous. Barry "A Gorilla Could Have Done My Job" Switzer won a superbowl with the triplets, and Don Shula couldn't win won superbowl with Dan Marino at the helm? No, no, a thousand times no!
Also, Gibbs should be higher. The only NFL coaches who I think should even be in the discussion of being higher than Gibbs, in no particular order:
Chuck Knoll
Vince Lombardi
Bill Parcells