But the question would have been, why were all of them there? They could argue that it was self-defense, but there were no witnesses and they were in a place that weren't theirs. The crime happened at Sam's house. There is too much going against them.
that is true
but since there are no witness then no one could say they were all there in the first place
the only person that can be pinpointed there is Michaela (because she stole the trophy from Asher and it turned u as the murder weapon) and Becky