Any plan, any master scheme he has ever concocted took less than five minutes. Often he needs only the first. In five minutes, disaster can be averted. Improvisation can be implemented. What he's going to order on his pizza can be decided.
Governments change, worlds shatter, stars fall in the space of a moment.
Standard Dean likes to wear shades. It's not an ego thing, nor a fashion thing, it just feels right. Dean in turn is protected. From more than the sun though. Imagine without warning this giant man being hefted out of danger's way by his own sunglasses.