No one else in the world talks about Bob Kennedy, unless they're all gung-ho about one of the best white guys in the history of distance running. But really, Kennedy's time isn't so impressive on the world stage at this point, and this generation of runners knows it. Teg and Ritz have both focused on becoming really good competitors and tactical runners, and it's done a lot more for them on the world stage than just running really good times (Alan Webb, anyone?).
There shouldn't even be a discussion of Lagat vs. Ritz for #1. Lagat almost outkicked Bekele. It's pretty obvious from his last few years that he doesn't care about times as much as competing. In the years he was running the fastest in the 1500, he did it because he had to compete with El G. Lagat has jumped in some faster races and tried to run faster times, but it's clear that he has more strength in tactical races. And hey, that wins him way more medals at the world championships that any other American distance runner has ever won, so he's the clear #1.
As for Ritz vs. Teg, I think Letsrun made the right choice. There's something about doing it first that always makes an achievement more significant. I think that Ritz breaking 13 served as an inspiration for Teg, and made it easier to him to break 13. There's obviously no way to know for sure, but a lot more people remember Roger Bannister for being the first person to break 4:00 than John Landy, who broke Bannister's world record right after that in a solo effort. Add that to the fact that Teg was 7th in his sub-13 race, and that he didn't run that well at the world championships (compared to his 4th place finish), and I'd say Ritz earns the #2 spot.