User blog comment:AltertheSilverBird/Total Drama: Danganronpa Chapter 7: Class Trial Part 2/@comment-27060311-20160815151835

Hm....there is many possibilites like fake suicide(Courtney/Dave), fake their execution(I think the easiest one in that scenario would be Justin to fake it out but Heather since plot relevance can happen too and lets not forget Dave that didn't even had a execution) or they could use someone to fake their death when in reality other person died using Sky for example. But I still suspect Courtney is the evil behind everything I think from all the deaths this one is by the easiest to fake and I think she have plot motives for doing it also I didn't digest how Monokuma mentioned the relationship between both Duncan and Courtney sounding so nautral when I think it wouldn't.

So I think my guesses for Mastermind/Saboteur are : Courtney/Scarlett respectively.