Very true, but against who? Leftwich didn't sniff a Heisman, and neither did Pennington. In fact, the more talented Moss was, the greater the gap was between him and who he was lined up against. So the more you think of Moss, the less impressive his exploits should seem.
I mean, he had the second-most receiving yards in 1-A ever up to that point and led a team that had been in 1-AA the year before to 10 wins. That seems good. The other factor was that people actually got to watch him. And he was treating MAC players like HS players. Now in one breath, you'll tell me, those are in fact high schools with tens of thousands of kids, but the weird part, and this is where things get foggy, is he also made them look like NFL players, because he clowned NFL players the same way. If you watched the dude play college football, you thought, he'd be killing any team they put out there.
I don't like relying on the NFL stuff, but if you're going to write off most of the sport, the NFL stuff is gonna come up. You can say, who did he do it against? but then a dude like Rice or Moss turns around and does it against players better than those at Michigan, Ohio State or Bama, we say "No, that doesn't count either."?
Some of the larger question cuts to the point of this list, and to a lesser degree your particular perspective. By nature, a list like this is picking between favorite children. There are probably 20 defensive ends and guards you can argue for. If they had that guy from Michigan and one from Minnesota, you'd find some other hole to poke, and if it was exactly your list, someone else would. It just says the list is made by people opinions differ, and there are an insane number of hard to compare options (i.e. Minnesota undersized zone blocking center vs Michigan drive blocker from the 70s vs whatever offense Bednarik ran).
Now, it's list about 150 years of CFB, so it might involve some weird players from the 1920s and it might span (gasp!) all of college football, from the powerhouses to the HBCUs to the mid-majors to FCS. If an FCS player could get a heisman vote, he can be considered. And I know, it goes against your somewhat narrow outlook, and that's the world. When you want indie rock CFB stuff, but only the mainstream indie rock stuff, you're going to not be in agreement with a lot of stuff a lot of the time.