Did Trumpy take out Tracy?

On first examination, it seems that the evil pod person is doing all the killing, but I believe its quite clear that one of the victims in the movie was not part of his killing spree. Oh sure, the filmmakers want you to think Trumpy is all fun and good, but there is strong evidence to the contrary that proves to be quite powerful.

First, it's established that pod people can't move very fast. When the evil one attacks Lara in the woods, he's moving at a top speed of about 5 mph. Taking this into consideration, it took Uncle Bill and Brian a few hours to get to the ranger station after leaving the house by automobile, where they were attacked by "evil Trumpy." After Brian is killed, Bill splits from the ranger station in the vehicle, probably driving very fast.

Which brings us to the second point. Bill arrives back at his house just after Tracy has been killed inside the rock group's camper. Killed by a pod person, who wanders off into the woods. Now are we to believe that the evil pod person, who can only move at 5 mph tops, was able to beat a car all the way back to the house?

Third, lest we not forget that Trumpy was unaccounted for during Tracy's death. Tommy was looking around the house for quite some time before he witnessed the attack on Tracy, and then it was still some time after that before Trumpy came back to Tommy's room. Just what was ol' snout face doing during that time?

Fourth, it's also establised that pod people are quite reckless and violent, even when not being provoked. Trumpy fries Tommy's toy robot, and the evil pod person attacks Lara for no reason whatsoever. While it's questionable if he pushed Lara off the cliff or if she just fell, the fact remains that he left his "glowing pimples" mark on her forehead just like he did with the poachers Sam and Matt, clearly claiming her as his kill.

It's quite possible that Trumpy went psycho inside the RV and killed Tracy, and and since he didn't both to put his own "glowing pimples" on Tracy, it's obvious that its another pod person. The only time that the "evil" pod doesn't leave his calling card is when he's in a hurry to flee the scene, like with Burt, Brian, Kathy and Uncle Bill. Trumpy had no reason to split so soon so it's clear that he has a different modus operandi then his more evil brother.

Finally, it isn't until late in the evening that the evil pod person attacks and kills Kathy in the bathroom, which would make it completely plausible that he had just arrived at the house after following the road for hours until he stumbled on it.

So there you have it. Trumpy tells Tommy a flat out lie when asked point blank if he killed Tracy, and then slowly conspires to take out the rest of the family as well before being left to die in the woods as he rightly deserves. Goodbye Trumpy, hope a grizzly bear eats you!