Well, it'd only be "less than .01% chance to see someone in a football uniform or cheerleading outfit" if you literally only saw one person.
We know from past discussions that the math is a bit more complicated if we look at multiple instances of some percentage chance, but here we're drawing from a finite pool (your chances of rolling a cheerleader increase a bit each time you fail to roll one).
To the point of my argument though...it's more shallow than that since I'm mostly only having fun with the math and the surprising revelation that there are a lot of friggan cheerleaders in the US!
Having "weird" zombies is a tradition in zombie films as it drives home the horror of say...juxtaposing a woman in a wedding dress with her new zombie-status or the clergy zombie (cheerleaders outnumber them by 8:1, though they'd be much more likely to be seen wearing their work-clothing). There are way fewer MC-style bikers out there than cheerleaders too. Should we be worried?
Surely having a Nurse, Cheerleader, Cowboy, Stripper and Biker, Construction Worker was too much specialization, but consider keeping one or two such odd zombie of the basic types. This suggestion is mostly for fun rather than hardcore immersion or maximizing the mileage from texture use.
In the most general sense I like almost everything you're doing with the game (except for that reduction of slots thing, my only real "concern").
-Morloc (endorsed by 4 million cheerleaders)