I think he missed a few old ones. And I'm not sure about his math, where 7 covers or whatever covers 1/4 of a year or something. Especially if you're counting commemorative issues.
But all that aside, interesting concept. I'd like to see a list of who's made how many covers, by year. I've seen all-time lists, etc.
Certainly some of our G1 brethren can get more creative, maybe put some different music to this?