Dvorsky and Sale aren't having expected seasons??? If you're going to praise Carlsson for what he's doing, you have to praise Sale and Dvorsky as well. Sale is playing in the Czech men's league, roughly (very roughloy) equivalent to the SHL or Liiga, last year as a 16yo put up a 2.0 PPG playing in the U20 league- there's no doubt he'd be putting up better than that if he were playing in that league still. Dvorsky is also playing in a mens league. It's below the SHL, yes, but it's still a mens league.
the USHL is a decent league, but even NCAA is much more competitive, and I don't think basing things solely on statistics in a worse league should be indicative of rankings.
It's certainly not impossible that scouts might rank those guys more or less than Smith, but it's definitely not clear cut. Personally while I like Smith his level of production in the USHL doesn't make me go "holy shit", and his production in the USDP isn't particularly special either. His eye test is pretty good, mind you. But I'd prefer to draft someone who has experience in a mens league already than someone who doesn't, all other things being equal.