No matter how many times it's explained, people never seem to grasp what Kenpom is.
Its not a ranking system based on record. It's a ranking system based on performance, specifically tempo-free offensive and defensive efficiency. It doesn't care who you've beat, it cares how you've played. To accuse him of pro-big 10 bias is just ridiculous.
As with any statistical data you have to understand what it means in order to use it correctly.
And his rankings have consistently favored Big 10 teams. Just because it is based on "statistics" doesn't mean it isn't biased towards one conference or another.