Re egress. Yes, I agree with all that and that he turned on phone on purpose because he felt it was safe to do so when he got to Blaine or wherever it is that is mentioned.. I meant that until he turned his phone back on, no cameras are mentioned, so we don't know how he got to Blaine or wherever it is and the PCA speculates he exited 'the area (ie King/Queen neigbourhood?)' off conegstooga onto Sand/Palouse then went south (but no cameras mentioned) based on where his phone pings (Blaine etc) when he turns on. The next camera that they mention is the Johnson Road heading back in to Pullman (at around 5.20 from memory) and that coincides with his pings at that time. So on that basis, I don't think they had camera footage of him on conestoga or Sand/Palouse when he was leaving as that was clearly extrapolated by the author of the PCA (it's in the section immediately after it talks about the car being spotted driving south on Walenta after leaving at speed at 4.20). As for camera footage from his south pings back to Pullman, LE did have footage for cameras in Pullman and Johnson road close to pullman for 13 November but not for Sand Palouse near cogestoga. This makes me think that they didn't collect/receive footage from that particular area for the am of 13 Nov or it was wiped by the time they figured the car must have exited that way from the immediate neighbourhood.
Your second paragraph makes sense if that was the the way he planned it IMO, We'd then have to assume that he was certain the white elantra that would be filmed on Queen. King, Walenta, /east Indian and Stymer (To name the ones in PCA) could not be traced back to him, Or he believed he had avoided all cameras into and out of the neighnourhood and that there were none on Queen road itself. THe PCA does IMO make it clear that he was not picked up on camera leaving after Walenta heading south. That could just mean LE didn't get footage before wiped or that there were no cameras at those locations.
Aside, I don't think it's given in the PCA that he is videoed on the 270 heading towards Moscow at 2.53, I can't find my bookmarked PCA and got distracted so once I get another copy I'll check it properly. I could be wrong and often am!
ETA: I can't remember where he pings from when phone back on at 4.48 and have no PCA atm. But I'm good with wherever he is placed at 4.48 and his route based on pings back to Pullman and can see that it could appear to be a circular route had he driven east past Moscow getting cameraed en route (then disappered into the rural towards East Indian). That might, to BK's mind, act as akind of alibi. I'm just not really with you on the premise, because of assumptions that have to be made as detailed above.