Actually, i'm pretty sure the top 3 all had 4 OUs. And my team really does suck, it has very little bulk and a very common weakness, and I already have 3 out of 4 of my OUs.
And about the even numbers it wouldnt be hard to do, an easy example is shown below.
Players 1, 2 and 3 give OU, players 4, 5 and 6 give UU, player 7 gives BL and player 8 gives 1, 2 and 3 OU, 4, 5 and 6 UU and 7 BL. Everyone ends up with 3 OU, 3 UU and 1 BL.