Great post....I think you are spot on..
Last week I was looking for a BIG to help me with my cup run....came across two players, one was a 179K big with strong GS and the other a 212K big with average GS....the six GS guy had lower DMI even though he had better primaries. So I went with the 179K big due to his DMI and better experience and he BALLED his arse off.
PS. I would also say that if the player is a NT player, 5 GS won't get him into the game.