Just a note, it has been proven through stats that 'protection' doesn't really work. It is completely mental. There was an article that talks about it a little in the recent SI when talking about Matt Holliday and Albert Pujols.
Protection has a lot to do with runners on base. If no one's on base, a pitcher's going to stick to his game plan. With runners on base, things can change quickly, especially for a pitcher that doesn't have a ++ fastball. Look at the Phillies. If Rollins is on second, which of these guys can you go after with fastballs and which do you need to do a dance with?
Utley
Howard
Ibanez
It's just a horrific task if you're a pitcher, especially because Howard has monstrous reach and plate coverage. Something low and outside over the plate is going to end up over the left field wall. You'd like to come in, but he gets his hands extended it's over the right field wall. So maybe you go after Utley, and then he takes your minor miss up on a fastball over the centerfield wall.
Stacked for power is going to help someone's numbers. It just depends which hitter sees more fastballs. I think this is better observed than looking at numbers, but it's real. Sometimes it just depends which hitter is hotter and which hitter is going through a slump and has more holes in his swing. That's going to change throughout the season.