DR lives in the same building she lives, right? And she never made it back to her building because she is not on camera. Also, if she was in the alley looking for her keys after she left JR's apartment, then she should have been on camera as well. And she is not.
AFTER LEAVING JR's 4:15 to 4:30am:
NORTH? I see no reason for her to go that way at all.
WEST? No. It does not make sense that she would go west if JR just watched her walk east to 11th and N. College. And she would have no reason to go that direction at all.
EAST? I really don't see a reason for her to go down 11th either. If she were thinking she would go to Kilroys that late it would make sense to go down N. College first past Smallwood right? Is there any likely reason for her to go this way vs. South? Also JR said she was "rounding the corner" so South seems to be it if JR is truthful.
SOUTH? 2 paths... a) N. College - this is the way that JR says she went...
she could get to Kilroys or her apt. this way. Makes sense. However it is a well lit and very short distance to Smallwood. Some linkage back to the gravel parking lot behind 5 North exists correct? Is there not more than one way to get from N. College back to the gravel parking area?
b) Going back the way she came through the gravel parking lots behind 5 North and then (if she would have made it that far) through the alley.
Her keys and purse were in the area outside of the Alley where the gravel parking lots are located. She obviously didn't get them, nor to the Alley.
Since all directions except South do not make sense, it would seem she did not get more than 1 block away (if she ever left) 5 North. So to me 3 possibilities emerge: A) LS vanished on N. College on the East side of the street B) LS vanished on her way to the Alley perhaps in the gravel parking area or C) LS was taken out of the apts alive or dead in some other manner.
Do you see anything that could rule any of these 3 possibilities out?