I'm having a bit of a hard time following your logic?
Each round, your opponent is determined randomly. Having an extra few thousand bot teams heavily increases your random chance of drawing a free win...
Additionally, with all of the extra teams, the tournament started with twice as many teams in it this season. At this stage, there are twice as many teams still alive in the tourney as there would be without the DVI teams (1024 instead of 512). To add to that, there are exactly 44 DVI teams out of the remaining 1024 teams, leaving 980 slots for DV+ teams.
That means that, at this time, there are 478 more slots available for DV-DI teams than there were last year at the same point.
So your statement...
A lot of active managers could still be in it if not for a needless sixth division full of computer teams.
...is patently false.
http://www.youtube.com/watch?v=oHg5SJYRHA0