Ranking list is not updated all the time so there can be jumps but I have not seem players getting more 60 def wins per hour - I an account can give 6 wins per hour so 10 alt accounts is all that is needed to become first. Even the player who became no. 1 in first half only got like 600 def wins per day. With 2-3 computer that is doable if you play 10-12 hours per day and have 10-20 alts.
If you have 2-3 computers it is even easyer to run many alt. We got 11000+ account in this event so I am cetain there are a few crasy people who would do just that.