Tf? You can say that Nunes is currently the greatest, but that's not what goat means you brick. Is Cejudo the FW goat? Was Weidman the MW goat after he beat Silva?
Bruz, she was fighting juiced to the gills half of the time, and she was mostly fighting fattened up BWs the rest of the time.
Go look at her record. After she popped hot she fought Marlos, Tweet, and Muxlow, who are FWs. After that she fought Daria, Smith, Holly, Lansberg, Duin, Evinger, and Yana before she ran into Nunes. Out of that streak, only Daria, who hasn't beaten anyone with a wiki-pedia page, was a proper, actual FW. They were all fattened up BWs. And Lansberg and Smith weren't even FW fights, they were catchweight because those girls were taking the money and couldn't make the weight because they were BWs.
Her career starts after she got done for roiding, not before. So her actual wins against legit FWs are Muxlow, Marloes, Tweet, and Daria. That's it. 4 girls. Oh, and of those 4, Muxlow had a record of 5-3, and most of her wins came against girls who didn't have winning records in Australia. Tweet was 6-4 at the time as well. Daria came into the Cyborg fight 8-1, which looks good at first, until you realize only 2 of those wins was against girls who had winning records themselves lol.
So . . . Cyborg's only two decent wins are Marloes and 6-4 Tweet.
Nunes coming along and ending her on the biggest stage for the biggest belt counts for more than those 2 semi-decent wins.