Okay, so everyone seems to be missing the obvious - Cricket really was involved from the start.
First, who do you think dug the holes to bury these people alive? Tommy? No, he can't dig and Travis will muss his permanent wave. Hayden? He doesn't do dirty holes, so there you go. Cricket.
Now, take a look at this picture.
This is unretouched from the video where Travis and Melanie first go to Sage's apartment. Notice the strange crowbar which appears as Cricket crosses the room in this still frame. Coincidence that Rick is hit with a crowbar and that Hayden threatens Melanie with one? I think not.
Okay, consider that Cricket's tag ends up in Becca's burger? Who had access to that tag? Uh, Cricket. Duh!
Now, here's an image from the visit to Sage's apartment, and again, it is unretouched, still frame from the video.
Notice the eerie mouse-like form growing out of the dog's rear section? I say mouse, but perhaps more like a pig? If a pig were drawn like a mouse? Yes? See it?
Consider the fact that you hear crunching in the garage video. Someone said that was potato chips, but if you listen carefully, you'll hear the distinct crunch of a week-old Milkbone dog biscuit. A week. That's how long it was between the video and when Cricket was left alone.
Finally, if you listen to Curtis in the video where he kicks Tommy. He does not say what you think he is saying. He actually says "I'll Do That for a COLLAR" not a dollar. It was Cricket holding the camera that day, and the laughs of Rick were inserted later to throw us off the trail.
There are of course so many more clues. I am just calling attention to the obvious ones.
So, let it be a lesson to us all. Just like when you smell a fart in the room. If you don't know who is the culprit. Blame the dog.