No I would want guys who are not NHL ready but may have potential to be playing every day in the minors (AHL, Europe, CHL, etc).
That aside, it's the job of a good GM to have players who can be effective in the NHL ready to play. Most observers said the Leafs weakness was depth on D. The young GM was asked about that and he said our depth was strong enough. Then when the depth got tested due to only two injuries, he was proven dead wrong.
Having guys in the A who one day MAY be effective NHL D men does not count towards your current NHL ready depth. This was another example of the young GM thinking just having a bunch of young guys constitutes depth. Just like he thought that if you rate goaltenders only by age, you will make the right call.
The young GM focused his energy at the deadline snagging a 4-5th line NHL winger rather than looking for NHL ready depth on D. This was a huge mistake. If it was his only mistake you could forgive it. But he's been wrong far more than right this year. How long can he keep using the I'm a rookie at my job and still learning excuse?