Renen Barao was the UFC BW Champ at 32-1 and IIRC was #2 P4P behind JBJ, had 3 title defenses as Interim/Undisputed because Cruz was plagued by injuries. Fought TJ Dillashaw who was a +550 dog, Barao was thoroughly outclassed after being rocked early and finally stopped in the 5th round. Renen rebounded with a win and hematched TJ, again being stopped in the championship rounds. Barao then bounced between BW, FW and CW, going from being the BW Champ and P4P top 3 fighter to going 2-7, missing weight several times and being cut by the UFC.