Could Tyler Robinson have killed Charlie Kirk?

There are a lot of people talking about not seeing Tyler Robinson leaving the rooftop with the rifle. But I don't see anyone asking if he could even made the shot. I'm no expert, but taking a single shot and killing your target at 200 yards requires more than a little experience shooting a gun. At that range the bullet is going to be affected by wind (if there was any), by a drop of several inches (or more) due to gravity, and shooting from a higher elevation is going to require compensation. Where did Tyler Robinson learn enough to...