I agree that there is not enough physical evidence available to prove whether or not an actual bullet nicked Trump’s ear.
One has to look at larger issues to have an inclination which seems more likely.
Given some stock option trading before the 13th of July and given some likely inside intelligence that Trump’s team routinely gathers on the “other” team, it’s quite plausible that Trump’s team knew of the coming assassination attempt ahead of time.
Given Trump’s long standing association with the Kennedy sons and Nixon, he knew, deep in his bones, that being a President and going after certain Deep State interests was a deadly game.
Given that he plans on being President for another four years and that he’s really pissing off the Deep State with his resilience so far to nearly a decade of resilience to increasingly vicious attacks, he had to know that a killer head shot from a sniper was coming up soon on his “chart”, and that he absolutely had to take out the CIA/FBI/DOJ/Secret Service complex that has orchestrated such plots in the past. Either they go, or he goes. DC is not big enough for both of them.
Given Trump’s long standing enjoyment of WWE wrestling and substantial career as a TV series movie star, and given his “grand standing” temperament, he’s perfectly character cast to take on an assassination attempt head on, and dramatically turn it in his favor.
Given Trump’s long history of helping setup sting operations to go after Mafia criminals (helping Giuliani become “America’s Mayor”), that’s the sort of game that Trump plays, and plays to win.
Given how trivially easy, just involving a handful of people doing what they might well be inclined to do anyway, to turn that assassination attempt in his favor (basically just “persuade” the real assassin to miss, and his closest security agent to cut his ear under that dog pile), and given Trump has had decades to let such possibilities age like fine wine in his thoughts … it’s hard for me to imagine this going down any other way. Certainly this seems more likely to me that once in a million miracles or luck.
The BIG picture points clearly. The publicly available and reliable crime scene evidence will almost certainly never decide this question.