Right. Barely any evidence, except... virtually the entire timeline and every important event released on video.
So again: which scenario is more plausible:
1. Killer plans to be at this place and time, with the getaway bike and gun and gear ready to go, has his breakfast and goes to the ambush area, where his target shows up to cross the street within 5 minutes, all intentionally planned and executed, or...
2. Killer just happens to be prepared and waiting with no idea when or if the guy would show up at this particular door, but he's there in the pre dawn anyway, I guess to draw maximum attention by standing around for 14 hours, possibly soiling himself during the wait? Or would he take potty breaks over at that Starbucks, hoping that's not when his victim might stroll by?