Welcome!! Good thoughts!!
Respectfully BBM, when you say "Perp parked at the rear of the building (to the right side of where victim parked under cover)" are you meaning the SE corner of building -rear but same side as the covered awning where MB truck parked? If so then the Suspect would have had to walk around to the other side of the building (North side parking lot side) as that is where the metal door is located, not at the rear. There are double doors busted at rear but those are at the NE corner.
April 18th press conf, Captain Spann stated at that time they speculated the Suspect left through same way came in, through the metal door which was to the kitchen., thats why JMHO Suspect didn't leave out same double glass doors MB entered. Spann also said that although the Suspect broke 2 or 3 other windows, they had no evidence that Suspect went out them (kitchen window and the 2 busted NE Rear doors) On the door handle being gone, again JMHO, I thinking the MPD/Ellis County Crime Scene Unit, removed the outer door part that the Suspect used a tool on, for tool mark evidence, not that the Suspect pried it off and took with, but possible I suppose. (I hope the LE have it)
JMHO, I am not sure they do not have video of Suspect after the murder. Captain Spann CID, chose his words carefully at that press conf, and the SW are summary of facts know, not all facts known. (per wording on the SW) The limited video release to me means there is evidence on them. The only reason we got what 2.27 we got is hoping someone would recognize the Suspect walk and mannerisms.
JMHO, I think the Suspect parked on the Northside parking, it slopes down, dark (sparse lighting) Coming in the drive, turning in front of church to go to the side MB parked, unless you were looking, you would not see. Went in and out same door got in veh and pulled straight out. Possible the parked car in distance is either possibly from interior camera, when Suspect broke back rear double doors which that motion turned on camera, or even the Suspect walking in that hallway later (if parked in NE rear). We have not been privy to where the surv camera is that caught this car. Also possible some view from SWFA camera, again we don;t know where camera is that caught that car, or MB truck driving into the parking lot.
ETA: I need to UPDATED this photo, the WHITE Square is actually the broken kitchen window, the metal kitchen door is to the left of it where the side walk is leading up to that metal door. I am not on my laptop so not sure how to do on tablet. Sorry for confusion. Just looked at and realized.