It all goes back to Warhammer 40,000 second edition when I Mathematically proved a plaguebearer was better than a genestealer, with or without the charge bonus. The fact that it is fluffy only made my naming of my Plaguebearers the Netherworldly Mathematicians all the better and somewhere along the way I learned the mostly useless but mathematically amusing formula and a banner was born...
We'll see how they do in the game now-a-days in about an hour or so...