Lots of untrue things are possible.
That changes absolutely nothing.
Oswald could have arrived at Tenth & Patton by 1:12.
Leaves Depository at 12:33
Boards Mcwatters' bus at 12:40
Exits the bus at 12:44
Enters Whaley's taxi at 12:48
Exits Whaley's taxi at 12:53
Enters the rooming house at 12:59
Leaves the rooming house at 1:00
By 1:01 is walking south on Beckley.