I was able to acquire the guy's Smashboards username and, at the very least, he's not BSing about being from the UK (you sometimes get people who pretend to live in Europe or Japan, but are just trolls from Kentucky when you check their IPs).
Another thing, he was given the name "Agent 3" for Inkling instead of the fanmade "Inkling," which is sort of in line with hard-to-guess stuff like "Mii Fighter" or "Duck Hunt."
I don't buy this yet, but he's at least done his homework. Bottom line is, keep voting K. Rool until he shows up; there's no downside, and in the unlikely case this is legitimate, the guy said "Volume of votes plays the most major role in characters getting chosen, because they want to make their extra work worth it by appealing to the most fans."