If Jen had backed up a bit, and thrown miss two stiches under the bus for lousy eggs, she might've been able to stay. That lack of sleep is def murder on some people, but her total inabililty to accept criticism, and particularly her swearing on her way out the door showed a character with some serious defects. Apparently daddy's pressure to be number one has left Jen with a spoiled superiority complex which makes it impossible for her to get a clue.
I believe Tom when he said he was judging the food. He doesnt seem like a power-tripper to me. Boiled bacon ain't gonna win you any prizes. Tre could've gone down, but he stepped back. Jen lead her team as well, so that was also a factor. For her not to say anything about Jaime was a bit messed up and the judges could have sent Jaime home easily. That said, I think most of the early departures are not people who would go the distance. They may be good chefs, but they're not as adaptable as they imagine, while others on the show are. Simple as that. There's no reason why the judges would want to send home two popular females to start the show. It's really as much about luck as anything, when you're dealing with this kind of pressure, but clearly, many of these people are up to the challenge. You can almost go through the list and see who is going to go home the next few weeks, because they are simply weaker than others.