If the shooting occurred before 1:10, then you have to explain why it would have taken Callaway ten minutes to get to Tippit's patrol car radio to report the incident at 1:19. He tells us what he did upon hearing the shots and it does not take ten minutes.
I agree. It took him no more than 3 minutes. Callaway's radio call took place around 3 minutes after the shots at 1:13 at the latest. The radio transcript times are not real time, and thus unreliable for timing purposes, as explained to the HSCA by J.C. Bowles, the man in charge of the dispatchers. I can demonstrate the 3 minutes in other ways as well, but for now let's just say there is corroboration for the 3 minutes from DPD officer Croy, the first police officer to arrive on the scene. He was in his car at Zang and Colorado when he heard the Bowley radio call. At 30 mph it took him no more than 2 minutes (and probably less) to get to the scene and when he arrived two civilians (Bowley and Callaway) were helping loading Tippit into the ambulance. So, Callaway was there 3 minutes after the shots.
In addition, if Callaway's radio call took place at 1:19, how else are you going to explain the discrepancy with the Markham time line? If Markham left home at 1:06 or 1:07 (as I believe she did) and the FBI timed the one block walk from 9th to 10th street as taking 2,5 max, she would be at in position to see Tippit being killed at 1:09 or 1:10 at the latest. The Callaway radio call scenario (1:19) requires Markham to have taken at least 10 minutes to walk one block. It also requires that Markham could not have catched her bus at 1:15 (be it either the 1:12 or 1:22 bus).
The sequence of events I have already described in a timeline based on witness testimony, documents and local knowledge, fits together perfectly, without any need for Markham's clock to be wrong, Bowley's watch to be wrong, the clocks at Methodist Hospital being wrong and DPD officer Davenport being mistaken twice about the time Tippit was declared DOA at the hospital.
It all fits, except for the times on the radio transcripts. In one of my earlier posts I have already demonstrated that it is physically impossible for Benavides to mess around with the police radio for two minutes (as you said he did), because that simply doesn't compute with Bowley's and Callaway's account.
Btw, Callaway told FBI SA Carter in February 1964 that he heard the shots shortly after hearing the news of Kennedy being shot at "about 1:00 PM", just like he said in his Affidavit of 11/22/63. In his WC testimony he is more ambivalent, because of the way Ball asks the questions.
Mr. BALL.
Now, Mr. Callaway, around 1:15 or so of that day, where were you? [talk about a leading question!]
Mr. CALLAWAY.
I was standing on the front porch of our office.Mr. BALL. That is at 401 East Jefferson?
Mr. CALLAWAY. No; 501.
Mr. BALL. I will show you a picture which we will mark as 538.
(The document referred to was marked Commission Exhibit No. 538 for identification.)
Mr. BALL. Does this show a picture of the office?
Mr. CALLAWAY. Yes, sir. That is it.
Mr. BALL. Now you went down there one day last week to have some pictures taken.
Mr. CALLAWAY. Yes, sir.
Mr. BALL. Did you attempt to stand in the same place you were at the time?
Mr. CALLAWAY. Yes, sir.
Mr. BALL.
Where you were standing November 22d around 1 o'clock or so?Mr. CALLAWAY.
Yes, sir.