Has anyone considered that XK was reciving her DoorDash delivery down on the 1st floor while BK was up on the 3rd floor. Seems possible and, perhaps even likely, that they then met face to face on the 2nd floor (as she was returning to her room and as he descended from killing the two girls). As he chased her into her room she exclaimed to EC that "someone is here". If she dropped her food on the way, that would explain why the roomates where concerned about her (per the 911), but not the girls on the 3rd flr. If the roomates peered under XK's bedroom door, they would have seen her lying on the floor (and perhaps her body was blocking the view of blood). Her roomates were probably thinking she was wasted to drop her food in the hall and then pass out on her floor.
Seems like almost everything happend at "approximately 4am" when, in reality, almost everything happend during 16 mins between 4:04am (when BK arrived) and 4:20am (when BK sped away). During that time, the order of DM's observations are know: noise upstairs (stuggling with KG), then "someone's here" (likely XK alerting EC), then crying (from XK), and then "I'm going to help you" (from BK). There are time-stamps for when XK stopped TikTok (4:12) and when the neighbor's security captured the "whimpering" and "thud" (4:17). All these events happend at "approx 4am" and so did the DoorDash delivery. The question is where does it fall in the sequence.
I'm new and haven't read this whole thread, so maybe this has already been discussed? Just wondering if anyone else had considered that DoorDash happened during (and not before) the murders.