The use of "a [adjective] [person]" usually indicates that the descriptor being applied is transitory or changeable. In this construction, we view the person a member in the set of all possible modes that the person can be:
When we arrived, we met a smiling Ichiro Suzuki.
When we arrived, we met a hungry Ichiro Suzuki.
When we arrived, we met a confused Ichiro Suzuki.
However, you wouldn't normally say:
A tall Ichiro Suzuki greeted us.
A 22-year-old Ichiro Suzuki greeted us.
Height and age are (more or less) fixed attributes. If you do use the "a [adjective] [person]" construction with a mostly-fixed property, you call attention to the mutability of the property. For example:
John Smith hasn't always been such a clean-cut fellow... I still remember that night ten years ago, when I saw a 17-year-old John Smith being hauled by the neck into a police car.
Here, we mean I saw the 17-year-old form of John Smith, from the set of John Smith at all his possible ages. Or:
I my cousin Kenny has always been a little short for his age, so I was a little shocked when a six-foot-tall Kenny greeted me at the airport -- the kid had certainly hit his growth spurt!
Here, again, we call attention to the mutability of Kenny's height and refer to a particular form of Kenny that is six feet tall.