Butting heads with your boss is a definite possibility on monday, but think about how far you want to push this. Mutual respect is more important than this one issue. You're on top of both short- and long-term planning from tuesday through thursday, and you're finding a way to give a favorite coworker an advantage as well. It'll come back to you sooner than you might think. Be your own personal think tank on friday, and if you're asked to get specific, get a little more time. The weekend's good for tossing ideas around.