Majoru Oakheart
Adventurer
I agree with [MENTION=4892]Vyvyan Basterd[/MENTION]Sure. But then those rules were adopted for an individual table. Having One Kind of Orc hurts the ability to adapt orcs to your own table, because it limits the diversity of published orcs and reinforces the concept that only one orc is meant to be used in D&D.
There were "one of a kind" Orcs in 1e, 2e, 3e, and 4e. Periodically there were variants published for specific worlds, but we've never had a bunch of alternate Orcs(or even the implication that they WERE alternate Orcs).