Fair question. He looks about the same in both images. Just off the top of my head, I've seen nothing so far that unequivocally places him at Parkland. At first glance it seems his image is superimposed upon the scene. When we hear him say in the video, 'here we are outside' (paraphrased) there is no actual image of him 'outside' it's just his voice. Same with the 'hiding in the closet' video. There are people standing around 'outside the closet' appearing to be quite unconcerned, just standing there chatting.
My take: he wasn't there. Need to be shown otherwise.
If it is the same guy, it may be a little surprising that there's just the photo and nothing else.
Wouldn't a graduating senior have more than that in the yearbook?
He could have been a freshman or sophomore or something.
If he graduated three years ago, he'd be, what? Twenty or twenty-one now?
No way is he that old.
Anyway, I'm skeptical after that "antifa Marxist KMFDM" photo of the shooter that actually looked nothing like the guy surfaced.
There are people who really like to spread false stories.