Some guys' arms are overdeveloped, in relation to the rest of their body. If you're one of them, or one of those guys whose been pounding arms pretty hard, you might lose some arm size b/c you won't be doing 25 sets of every bicep curl variation imagineable. Most people find that by adding weight to their bench, dip, OHP, row, and pullup, that their arms grow or stay the same size. I haven't done direct arm work in quite a while and they're holding steady and feel thicker and stronger.
It really shouldn't be a problem b/c doesn't the layout have room for 3x10 on curls and triceps work at least one day of the week? Starr's program has room for "beach work" once or twice weekly for those who are worried about it.