User blog comment:Linathan/Squad Spotlight & Guide: Trial 007/@comment-24570336-20150825084125/@comment-26140304-20150825133408

Haha, it's definitely possible to complete the trial with one mitigator. Double mitigators are to ensure that you can easily pull off stacked mitigation, but with Elimo's UBB being 3 turns, you can make use of those three turns (actually two if using just Elimo) by using her BB. :)