20 hardcore players with good amount of skills + full consumables and good gear = you destroy the core. And yes, DreamState is a very good guild (like APES) because they play private server for a decade, and we all know private server raids are overtuned.
Do you know the World Record of Molten Core is 18mn ? Full melee + Full consumables with 40 hardcore players, and you destroy the raid. And it was on private server, so in Classic the raid is post-nerf and you can do better.
Meanwhile, you, and probably most forum readers, will do Molten Core in 4 hours because you are not hardcore and you don’t have the experience they have 
. This is exactly the Method vs Plebe guild counterpart in Retail if you prefer analogy than pure example.