One thing I don't understand about offensive defensemen and their development is all the effort coaches put into trying improve their defensive play. One of the first things taught in management is that you use your best assets for biggest opportunities not biggest weaknesses. Ghost's handling seems to me just like that. Amazing instincts, team's best shot, all the promise of up and coming player and coaching that leads to watching amac play from the pressbox. Reliable, good in all three zones, ...
It's very simple, they're DEFENSEMEN.
If you just want them to focus on scoring, use them as forwards
A two way defenseman like Provorov can dominate the action for up to 25 minutes a night, everywhere along the ice, no forward can have that kind of impact.
Even with Ghost, if all he does is play well in the offensive zone, it limits his value, being at least adequate in the defensive zone means he's a positive at one end of the ice and NOT a negative at the other. And to be adequate in the D-zone he has to learn to use his body (not like Gudas, but don't shy away either, ride your man out of the play and position yourself to protect your goalie) and be responsible, don't try to force big plays exiting the D-zone and cause bad turnovers.
The best thing they did for Sanheim is to force him to play defense in the AHL, the problem for talented players is a lot of what they could do in juniors or college doesn't work in the NHL (see Konency learning this the hard way this season). It's like the college QB who could throw it all over the field against slow CBs, then finds out how small the windows are in the NFL. For a defensemen, he has to learn that NHL forwards are fast, you can't outskate your mistakes on a regular basis, and that NHL forecheckers can be relentless and feast on sloppy passes - you have to make smart, decisive decisions with the puck.
Provorov is a freak, no defenseman that young should be so disciplined and have such a high hockey IQ.
Most young defensemen need years of coaching to approach that level of play.