Where he would go is hard to answer, because there are really 2 different responses due to the different scenarios.
Let's use age and league adjusted numbers to get a rough idea looking solely at CHL forwards. Looking at last years first round picks, the three highest age-adjusted ppg's were Matthew Tkachuk with a 2.19, Alex Nylander with a 1.55, and PLD with a 1.44. These factor in all CHL games (regular season and playoff games) and the WJC weighted appropriately. Last year, Sam Steel had a 1.08, this year Steel finished with a 1.55. Looking at this, he is probably worthy of going top 10 to 15 if we only use the info from this given season info on Steel. It was noticeably ahead of his fellow CHL centers draft years such as Logan Brown (1.36), McLeod (1.19), and Howden (1.08).
Now, if we were to do a re-draft factoring in everyone's draft +1, it gets a pretty intriguing. Outside of the two superstars and Tkachuk took at the top of the draft, very few forwards (and more specifically centers) outside of Clayton Keller have dramatically improved their stock. McLeod has basically held the same with 1.13 adjusted age/league ppg, same with Howden who had a nearly identical one. Brown (.93) and PLD (.92) both had disappointing seasons. Non-CHL guys stocks have stayed relatively the same such as Jost and Kunin. Borgstrom's and Frederic's have improved. Jones, Thompson, and Gauthier stocks have either stayed in neutral or slightly decreased. Bellow's has noticeably decreased. Of the non-first rounders, you can say Raddysh stock has probably improved the most.
Looking at both scenarios there is a fair argument that Steel could go top 10. There is a strong argument, outside of Matthews, that Steel is the best center in the 2016 draft. Arguments based on size and "tools" can be made for PLD (size/physicality), Brown (size), Howden (size) and McLeod(skating/size), Jost (tenacity, 2-way play), Borgstrom (size/puck control) but Steel might be the smartest and possibly has the highest offensive upside. The guys he is 100% not above are Matthews, Laine, Tkachuk, Keller, Puljujarvi, Chychrun, and McAvoy. You can probably add Sergachev and Juolevi to the list. Then he is probably in a grouping with A. Nylander, PLD, Bean, and Jost. Breaking it into tiers, you probably have something like this.
Matthews
Laine
Tkachuk
Chychrun
Keller
Puljujarvi
McAvoy
Sergachev
Juolevi
Steel
PLD
A. Nylander
Bean
Jost
Kunin
Borgstrom
Brown
McLeod
Just for quick reference, he would have the second highest CHL adjusted ppg in this draft behind only Nick Suzuki, and slightly ahead of Yamamoto. It would be noticeably ahead of Patrick, Hischier, Tippett, Vilardi and Glass. Now, some of those guys are projected to make a big step (Glass), and Patrick's draft-1 season was 1.72 higher than anything anyone else in this draft has produced in any year. I'd think a team would take him top 10 in this class also, with some discussing him in the top 5.