4 1st rounders is rare because no team wants to have that empty cupboard, drains long term flexibilty, too much risk.I've been thinking about the Durant trade all day. 4 unprotected 1st round picks for 4 seasons of Durant. That is essentially the equivalent of a team trading an unprotected 1st four straight seasons for a high impact rental which doesn't sound nearly as extreme as 4 1st round picks at once. Would people here trade the Leafs next 4 1st round picks (unprotected) for a player who will be around for 4 playoff runs? The only obvious examples of this would be Kaprizov or Robertson or McDavid (of course). There is no precedent (to my knowledge) of 4 unprotected 1st round picks being traded for 1 player which leads me to believe a team could acquire nearly any player if they were willing to offer such a package.
*Obviously, like Durant, the Leafs or any other team would have to create salary to fit this new impact player in.
But the value of 4 1sts is not that crazy at all. The age old 1st+ A prospect (1st equivalent) + roster player (1st+) + lesser piece