Yes Simmons has struggled up top and I blame that on the Braves for rushing him into that role. The problem is that Fredi just doesn't do anything. I really have no idea why he hasn't changed the lineup. Heyward is clearly a solid option.
Uggla Heyward J Upton Freeman McCann C Johnson BJ Upton Simmons
Uggla's on base percentage is around .323 and he has decent speed and runs the bases fairly intelligently. With his improved vision he is making better contact and is proving this year that his increased walks last year were not because he was hitting near the end of the order.