That is kind of far-fetched, as there is nothing that indicates that the elder Rafael Cruz was even IN the United States in the time period indicated (1963). What this may turn out to be, is that a person of similar height, build and facial conformation was in the crowd, but perhaps some kind of biometric facial recognition could be applied.
These rumors are scurrilous at best and downright slanderous if persons persist in reiterating them.
LBJ had Kennedy killed. Not a coincidence everything took place in Texas, and John Connally was also injured. Or maybe Connally was just collateral damage.
LBJ and Connally were close in political circles, at least until Connally became a Republican.
Check 46.
There is evidence that Cruz was in the US at the time.
Raphael Sr met cRuz’s mom, Eleanor, in New Orleans, in/around 1963. They moved to Canada, shortly thereafter.
Someone has done a painstaking timeline of cRuz Sr. It’s been posted, here, several times. If I find the link, I’ll post/ping.
Dallas was the third go at JFK in Nov. 1963. (Both the now well known, earlier in November 1963, Chicago and Tampa assassination plots were broken up and it came down to Dallas). I agree with the LBJ angle. He was flat out ruthless in his quest for power and his entire life shows it.