You make some excellent points, embufum. I’ve also always gotten the distinct impression he was purposely avoiding Clint, thus explaining why he left on his own without telling anyone.
I have to admit the street layout totally confuses me without studying a map so I’ll happily leave all that to you.
There is only one other scenario I want to add in as a possibility.
Perhaps after Brian’s escape from Clint and Meredith, he met up with another person or persons, possibly planned, maybe not, and left in a car with them after exiting the UT. This could have happened in the Wendy’s parking lot or shortly thereafter.
Then of course we’re still left with, where he ended up afterwards is anyone’s guess.