More speculation on route, this time on the approach: directly south on 800 W from at least where it intersects with 800 S.
He then crosses 800 W on a diagonal when he is about at the halfway point (just as he is approaching the house with the surveillance camera over the three garage doors. He is limping like crazy.
I then am assuming that from the end of 800 W, he crossed Campus, and tgem either went up Campus past the LSS Institute and veered right across the grass toward the loading dock of the building he entered, or, he went straight across Campus and headed down Heat Plant Rd - probably also entering via that same WSW area of the building (between the west corner and the dock).
His return route would be a retrace, except that once he passed the end of the chain link fence along Campus, he took a right into the woods behind the UVU ROTC (this is before you get to 800 W) , and travelled through the back yards, exiting on a sloping short road between those back yards and 800 W (or via the woods just west of 725 W - but I think he came back out on 800 W a couple of houses down, and across the street from surveillance camera house)
In the TMZ video (this is my interpretation only) as he exited from behind the houses (the back yard areas) back onto 800 W, he was seen running down that short paved road or drive. This short paved road or drive may not have been built when the GE images were last taken.
This makes me think that if he was injured dropping off the building ledge, it maybe wasn't a serious injury, I'm now thinking all videos that show him limping are on the way to the shooting, and that the limping evident in those videos was caused by the discomfort and restriction of concealing a 30-06 in a pant leg (and possibly going up between your back and a backpack?
If he did approach by limping south down 800 W, where could he have come from before that? Maybe he had parked in one of the very large lots surrounding the Utah County Academy of Sciences Seminary Building and The Church of Jesus Christ of Latter Day Saints. He also could have parked in any of the several very large UVU parking lots along both sides of 800 S (if unrestricted). Of course he also could have walked 5 more miles... so, idk. Hope they catch him soon
Jmo