I must admit, I've lost a bit of interest in doing the NRL Grid in recent weeks, but I do take an interest and pretty much ONLY do it if the Knights are involved ... but as good as I can do (I've gotten a couple of 0.00 individual scores), there are ones that just don't have scores in the unicorn or wizard catagories. I forget what it was now a month or so ago, something like a Knights player who'd scored 100+ points in a season during their career. The most abstract, least obvious player still scored a 5 or a 6. And I went through EVERY NRL season's records and compared every one of those 100+ points players who'd ever laced on a boot for Newcastle.
Maybe I've not quite understood the game, but the way I've been thinking it is, is: Before you choose your player, the boxes have 3 numbers. A number next to a down arrow that I've taken to be the lowest score possible from that box's catagories, another number next to an upward arrow that, conversely, I've taken as meaning the highest score possible (apart from 'wrong' which gets you 100 points!), and the main number that I'm confident is the amount of players eligible to be a correct answer in that box.