I agree with almost everything you say here. Candace Owens says she has the footage of that camera behind Kirk when he was shot. However, on video shared by Hive account@manorvillemike below, it does in fact show the Brown Shirt spook moving just as he does in the video in the OP, for whatever that's worth.

Edit: according to Candace Owens, there is no exit (or wound of any kind) on the back of Charlie Kirk's neck after he has been shot. There is no way a .30-06 would not leave an exit wound, nor a 5.56 or other high speed rifle round. They just pack too much energy, as the video shared by Hive account@manorvillemike shows when they shoot a ballistic dummy head with and '06, and it literally explodes.

However, that isn't from the entry wound. The entry wound from a .30-06 is .30" across, because the bullet hasn't begun to dump it's energy by deforming and impacting the mass of the target. It is the rapid expansion of bullets after they enter the target that creates a significant wound channel, and exit wounds are much larger than entry wounds for soft pointed hunting ammunition. However, metal jacketed armor piercing ammunition does not expand and create a large wound channel, dumping it's energy in the target, because it is constrained by the metal jacket of the bullet. Full metal jacketed bullets are designed not to deform so that they can penetrate body armor or other impediments and penetrate the target. The exit wound of a jacketed bullet can leave the same size hole it creates on entrance, unlike soft point hunting ammo. Even a much cleaner hole in you than that made by hunting ammunition is a significant wound, and can be fatal if it pierces the right parts.

Only something as small as a .22 rimfire could potentially not leave an exit wound in a target as thin as a human neck. .22LR bullets pass right through rats, for example, and might well pass through a human neck as well, if they didn't impact the spine. I've used .22LR to kill downed cattle, and .22 bullets certainly pass through cow skulls to kill them instantly with a well placed shot right behind the ear. Every high powered rifle round would similarly pass through the neck, and even an armor piercing full metal jacketed round, or a .22 short, would have killed by rupturing the jugular as it did Charlie Kirk's. However, almost every round I can think of would leave an exit wound, passing through the neck - except possibly something as low power as the .22 short.