It is way to early in the season for a mock draft. I can see rating college players by position and possible draft position (1,2,3...) but certainly not designating them to particular teams. Not at this point.
I'm pretty sure they know it too. Trick is, they're doing it because that's what Walterfootball does and they're just having a little fun with it. I do see what you're saying though. If they were being serious about it, I'd say no mock drafting before not seniors declare.
/that and agents paying off Kiper to raise the players they just signed up on his big board.