As the other poster pointed out, those both show the Big 12 as second (or virtually tied for it). The reason you're not understanding is because like most talking heads you aren't considering that the bottom half of a conference is also in the conference. You can't focus only on the top 40% of it.
For example, one of the shitty teams in the Big 12 took Oregon to the wire. Texas did not get as many virtual byes by playing complete dogshit teams as other top contenders did despite what many around here think of the conference. The Big 12, as it has almost always done, had a much deeper pool of decent teams. It has been the second best conference in the country overall during the time it has existed and has several seasons being the best conference. Completely inept administrative leadership has fooled even its own schools' fans into thinking it is also competitively weak. It isn't and hasn't ever been that.