If anyone does that, for the reason you listed, his last name will be Richards and his first name Coach.
Let's review this if we can get him much closer to 200 pounds. If his 170 estimate is close to accurate he probably needs to mature a bit more physically.
He definitely needs to mature physically but he's not gonna be a 200lb guy. 185 maybe, just a small body type.
As for his immediate future, i'm sure he'll be headed back to Portland and show whether or not he can be the guy on the team.
Still two years away, IMO ... another year in the WHL, and then likely one (or at least part of one) in the AHL. Let's not forget that he played on a team that scored 338 goals this year, and included Brenden Leipsic, Chase de Leo, Nic Petan, and Taylor Leier ... all of whom were above or near the 80 point mark. While Bjorkstrand was absolutely a huge part of the 338 goals, playing with that kind of offensive firepower around you makes things a little easier.
His offensive zone play is close, notably his skill. His timing is good, his passing is good, he has a very quick release and an accurate shot, and his vision is impeccable. He'll never be Boone Jenner in the corners or Derek MacKenzie on the backcheck , but he does need to get a little bit stronger to hold up against the rigors of the NHL, and at least be able to pick up a defensive zone assignment against guys who are 200+ pounds.
The Jackets have shot themselves in the foot over the years, by rushing guys to the NHL before they are ready. Bjorkstrand is a guy that, I feel, can be a big contributor, if he's brought along slowly and comes in as a polished, grown man. I like the kid ... if he is persistent, works hard, and can play his game at NHL speed, he's going to be a steal.
BTW, anyone 6ft (or close to it) can get somewhere between 190 and 200 (with body fat in the highly athletic range). He can also be quite quick and agile at that weight.
He would have to put in the work, but it can be done.
If you look at his three years older brother (Patrick Bjorkstrand) that plays in KHL for Medvescak Zagreb -> he is 6 foot and weighs 192 pounds. He is actually a very feisty player that has become a regular 4'th liner and PK specialist for the KHL club coming as a rookie from Mora in Allsvenskan (second tier Sweden).
So Oliver Bjorkstrand should likely fall within that same weight with age and focused training in 2-3 years time (perhaps even a little bit more and faster, since he will start at an earlier being very focused on getting NHL ready, compared to his older brother that wasn't drafted).
I haven't seen any of him other than some of his teams highlights but to me it seems like he's smart enough and quick enough that with a little more strength he should be fine. I know it's just juniors but a couple things I've seen is he's not afraid to get in the corners and actually VERY slippery in close with the puck. Offensive skill is definitely there. Passing and shooting. Reminds me of Vyborny.