I'm not sure it's harder ... it's different kind of hard. To get a #1C, you need to do good drafting and have a high draft position, that's not easy, either. To get that #1D, draft position is less critical, but you need to again do excellent scouting, and then pile up the prospects because the probability of hitting the jackpot on any given individual prospect is quite low, and it usually takes a number of years before they mature. Kind of like goalie prospects.
We have a fairly solid number of picks for the next few years now. And we have been picking up undrafted prospects, too. Whether one of them turns out to be #1D is an unknown, but as Commandant says, the more you have, the more likely it is that one of them develops into a #1D -- or at least a #2D.