Because none of those teams have better wins than Alabama and all of them have worse losses (unless OKSt happens to win Bedlam, then I'm willing to give them their shot). Championship caliber teams in the BCS era don't get nuked a home...or if they do they better have a damn impressive resume otherwise. Sorry but the wussification of everyone's schedule (following the SECs lead, mind you) has given the SEC the advantage. If your conference isn't up to snuff with the SEC you better damn well schedule some solid OOS opponents...and win. Oregon was the prime example...except they blew their shot by losing to USC.
good luck with that