So I know this kid pretty well since they are from the same area and played for the same youth teams my son (who is now 14U you as well).
Jonas is from Sonoma County originally, and played mite and maybe a year or two of 10U for the Santa Rosa Flyers, but the Flyers basically field B and BB with the odd A team here or there, so the elite kids often move to a club an hour or so away to play tier level. That's what Jonas did - so does my younger son. Jonas played his bantam years for Golden State Elite (GSE) 14U AA level, the same team and same position (No. 1 LD) that my son plays, although my son hasn't hit puberty yet and stands only 5'1" (I'm 5'10" and his older brother is 5'9"). My son left his AAA team last year to join this team so it's a really good team and has a really good coach (same one Jonas had). So Jonas double rostered with the local HS team and 14U AA team (you can do that here) - my son cannot as he's still in 8th grade. He then moved to Jr. Ducks and played 15O AAA and went to Optum Academy at Great Park Ice in Irvine where the Ducks practice. He then made USNTDP early this summer and is heading to Plymouth, Michigan.
Jonas and my son played a little pick up hockey this summer at the local Santa Rosa rink during public sticktime. Great kid - coached my son up, too. Says his favorite coach is still the 14U GSE coach. Outside of stick time, I last saw him play his 14U year. I can tell you that he is a legit 6'5" and possibly 6'6". He is a great skater. He looks as smooth as my son (who reminds me of Jordan Spence as a skater, great edges and lateral quickness and transitions). I've never seen someone that big skate that smoothly. At 6'6", you'd think that he's a defensive defenseman, but he's got really good offensive skills, great shot, great vision and his skating ability walking the line is top notch. The downside is that he is a beanpole. I mean really thin. It's gonna be a bit of time for him to fill out. He's not afraid of contact or hitting, but he'll probably need to put on some strength. I'd say he's about 170 lbs, which is the weight as my older son, who is a bulked up swimmer. But he also has a pretty good wingspan and stick with that reach of his.
Bottom line - he's got 2 years before draft year. It's a long time. But he's a first round draft pick and might work his way into the lottery. You just can't teach that size and skating ability on defenseman and he's got really good hockey IQ but he's a little bit behind in his development probably because of the California roots.
A little side note. Ben Kevan (also a possible 1st rounder this year) also came from the GSE program. He did not overlap with Jonas as Jonas is one year behind and Ben left his major 14U year for Jr. Kings. But two potential NHLers on a youth team in northern California. Unheard of... that would've been fun.
And don't get caught up in the AA versus AAA game. Some of the AA teams in California are better than the AAA teams.