Yup! as you have said that all fighters were from a loss I have check all fighters under the main and Preliminary events because I know for sure that Jairzinho Rozenstruik had lost to Cyril Gane and Augusto Sakai to Overeem, and I have listed all fighters and what I have research.
Main Card
Walt Harris to Alexander Volkov
Marcin Tybura to Augusto Sakai (but have won 4 Consecutive wins)
Roman Dolidze to Trevin Giles
Laureano Staropoli to Tim Means
Santiago Ponzinibbio to Li Jingliang
Miguel Baeza (Undefeated)
Tom Breese to Omari Akhmedov
Antonio Arroyo to Deron Winn
Preliminary Card
Makwan Amirkhani to Edson Barboza
Nate Landwehr to Julian Erosa
Tanner Boser to Andrei Arlovski
Ilir Latifi to Derrick Lewis
Francisco Trinaldo to Alexander Hernandez (But have won 3 Consecutive wins)
Muslim Salikhov to Alex Garcia (But have won 3 Consecutive wins)
Alan Patrick to Bobby Green
Mason Jones to Mike Davis
Manon Fiorot to Leah McCourt (But have won 6 consecutive wins)
Maryna Moroz to Angela Hill (But have won 2 consecutive wins)
Well, most of the fighters have come to a loss, and as you see that there are fighters that have won consecutive fights and only Miguel Baeza was the only Undefeated and you are right most fighters from this event will now show to UFC that they can still do this and needs to prove themselves that they have overcome their experience in losing a fight.