Another thing about Sklenar: He seems deeply random in a way, yeah, until you consider the fact that John Papsidera, who is the DCU casting director, seems to really really like the guy. A bunch of the small roles that he's gotten in his career that then became getting cast on something that's actually massive (Those Sheridan shows may not be talked much in social media, but they are huge) as one of the leads can be attributed to Papsidera, who has been continously pushing for him in projects, and it's something that I do think is something to consider, as it's likely Papsidera would push for him on something like this as well.
And between that and him getting cast as the romantic lead of a somewhat popular YA book, idk, I feel he may be close to a complete unknown now but he's also just at that very very sweet spot where I think he's 1 step away to nabbing something that's actually big (Well, 1923 is already massive but I mean, in terms of making him a name I guess). And I can see it being this, if they really really wanna go younger. Either way I wouldn't be surprised if he ended on the DCU somewhere eventually. He's someone that's easy to overlook but that I really would keep an eye on.