If the question is answered in the original post you shouldn't be answering it again. There is even a sticky in this forum asking you to do that, which is why you're getting an actual infraction as opposed to a warning. Just report it. Thanks.
If you read anything in the original post in this thread, you will see that being expertise capped is not vital to unholy dps.
The haste benefit has a higher stat weight than expertise, making Scourge Reaver's Legplates significantly better in terms of output, over the set piece legs.
The Scourgelord Chestpiece is indeed the strongest chest in the game. The armor penetration available on the chest significantly outweighs the stats of the Scourgelord Leggings.
Please refer to the original post in this thread for stat weight comparison charts