Sabin and Meyer are great coaches, great motivators, and great recruiters. This is not debatable. But, with that said it is always going to be easier to recruit great talent to Alabama and OSU than it is to Nebraska.
If you don't believe that than you aren't facing the facts. OSU has 3 great QB that could have played this year. Two of those guys are from the state of Ohio, they grew up wanting to play at OSU. Where do you think Joey Bosa is from? When you can pull a dozen 4-5 star recruits every year from your home state and combine that with a great coach it is just that much easier to do it. When was the last time the state of Nebraska produced 2 QB of that caliber within 4 years of each other? When was the last time the state of Nebraska produced a D-End that comes in as a true freshman and dominates like Bosa did last year? How about never.
The same goes for Alabama.
Alabama, OSU, Georgia, Florida, FSU, USC, Texas etc always have talent and always will. When they have a great coach also then things happen.