That's my thinking as well. They obviously knew that they had no shot at the 1st rounder CHL forwards (or knew that those players were sticking in the CHL), that's why the forward spots were filled up early.
And if they were only in the running for one of those two big D, then I'm guessing we'd have seen a portal or other commit already on D.
My guess is that they are holding both spots open to see how it lands.
Plan A - land two of the big boys
Plan B - land one of the big boys, then get a portal/commit
Plan C - land zero of the big boys, panic, fire & brimstone, pitchforks, then get two portal/commits