I think The one who got Scooped was William (the dad and the Real Murderer).



My Theory being that there was 2 "Purple guys", One being the dad who got Scooped did murder kids and the other being the son ( Michael) who was tricked into being in going back to Freddy's and got "springtraped".



Cause if you think about it, If someone got scooped there would be no organs left to stab. Plus the blood that appeared when Michael got "springtraped".