It is difficult to ascertain the absolute identity of the man with the open shirt and his activity. However...it does not gel with the time of either the bus/cab report or the observation of a sheriff's deputy claiming he saw Oswald enter a car heading west on Elm right after the shots. Either direction could lead southwesterly toward the theater.
Appreciate the helpful tidbit, Mr. Freeman, that either direction--further down on Elm Street towards the Triple Underpass and/or use of the Houston Street route--eventually intersects with the Texas Theatre. Either option is well within less than 5 minutes away. That said, where I respect your assertion, quote, It is difficult to ascertain the absolute identity of the man with the open shirt. unquote, there's only one single person that afternoon in that plaza at that time that matches the physique of the wrongly-accused, the identical colours of his clothing from top to bottom, and dressed in the same manner as described or demonstrated by three different individuals (Mr. Mentesana's home film; Mr. Brewer and, of course, Ms. Postal). One captures the shirttails worn out, and the other two describe the same shirt colour worn out.
IF you have some time on your hands, take a look at some video material of the wrongly-accused passing out leaflets down in New Orleans. Note his mannerisms, his stance, and compare with his actions--as noted in Mr. Mentesana's home movie film. I'm using a public-computer at the moment, thus am not privy to all of my archived footage of his staged activities down in New Orleans, but here's something--courtesy of Mr. Morrisette's channel-- I just found on Youtube ---->
It's him in Mr. Mentesana's home movie; then same shirt worn in same manner as noted by Mr. Brewer; and, with a natural hat-trick evidenced via carbon-copy by Ms. Postal's observations as well at the Texas Theatre. The wrongly-accused did Not shoot anybody. Anybody. He was in Dealey Plaza loooong after the hastily contrived script mired in the stench of horse manure wanted us to believe. Again, it's him.