I think it is good to have a complete stat block with all the cool stuff your bbeg can do… but on the page with the combat stats I want to see only what is useful in the encounter. He might have Summon Cats 2, but if there are no cats on the bridge of the starship where the encounter is, I don't really need it. However, if the bbeg gets away and becomes a thorn in the side of the PC throughout the campaign, then I want access to the complete stats. I might have the bbeg lure the PCs to a planet overflowing with cats. Then, there will be lots of scratches.
Garrett