First, Bec hasn't fought the "best of the best", she's fought gatekeepers and part-timers.
The UFC should implement the PVZ Rule, whereas anyone that loses to PVZ gets immediately cut. Seriously.
7-7 Bec
5-4 Chambers
4-5 Curran
0-2 Himes
6-4 Stautzenberger (in her defense it was her pro debut)
1-1 Gaza
The only person PVZ's ever managed to beat that maybe shouldn't be cut due to a crap record and skills is Herrig, who should be cut because of her face and personality. Up until her last to wins, which were against decent competitio by Wmma standards, her 11 wins came against competition with a combined 68-75 record. Scrubs that weren't even .500 on the regional, behind the local Walmart type scene.
The UFC really should be using Invicta like WEC as a feeder league, and quick signing people that can't win >60% in the lowers leagues. They also should be much quicker to cut some of these "fighters" that didn't pan out and see if they can gets some wins elsewhere.
Almost all the girls on TUF are pretty shitty, and at least half the women in the UFC are shit. The UFC wants to be the big leagues, then don't sign minor leaguers.