That's a logical consideration Spellbound. Someone who knew the campus, knew how to move furtively. Someone who knew her schedule, was observing/watching. Someone who knew the roomies, and knew Julia would be alone. The timing seemed well planned, just before break when she was alone that night.
Someone who knew how to get in and out of there without detection.
And frankly, I'm not so sure someone didn't see something. It almost seems impossible that they didn't
Without getting too graphic, I am speculating this was either one large strong person, or it had to be two. I can't imagine moving someone around who was over a certain weight without a great deal of effort, and noise. But that bathroom would have been tight enough with two people in it vs. three. Someone very strong who maybe knew how to lift things. Fireman's carry or weight lifter, or.... (*Not* suggesting a firefighter btw, just referencing the lift). The reason I am hung up on this concept is because there was no mention (although I don't know) of signs that Julia wasn't handled "efficiently". Meaning bruising on the face, etc. from moving her around. (Apologies for the indelicate nature of that thought). Perhaps there were these signs and LE just hasn't released that info. But if there weren't signings of banging around or bruising, it means she was moved efficiently. This, to me, suggests a very strong person, adept at lifting and moving.
This is what I am dwelling on this morning over my coffee. This case remains on my mind. It will get solved, and I truly believe the Perp knows that and is looking over their shoulder.