Kirk's framing/receiving low in the zone is amazing. Better than Jansen. Jansen, imo, is far better in the upper half of the strike zone. Last season Kirk made some big gaffes defensively speaking, but he was green and is getting better. At the end of the day, his body is a big concern. The roly poly body shape is a concern. Then again, remember Kirby Puckett, he made out okay.