D is always higher risk and you tend to get less value out of them on ELC's and their first long-term deal than comparable forwards. For example Tavares throughout his first 6 or so years in the league gave you more value than Hedman. Hedman ended up being the better player though. I've long thought when talking about the elite players at the top of the draft an 18 year old forward is as easy to project at a 20 year old D-man or a 22 year old or older goalie. How forwards tend to drive play and make players react to them makes it an easier adjustment. Hence why the easiest position in the NHL to break out at is wing, which is why we often see center prospects start their. Whereas a significant portion of defenders role is being reactive. Granted, elite D-men like Schaefer put pressure on teams defenses and force them to react like Q. Hughes, Makar, Dahlin ,etc.