Big Dog couldn't handle their big men when they went to the perimeter. They shot well enough to make him have to come out on them, but then had the speed to go around him when he came out. Poke is in a much better position athletically to handle that situation. I think Keith also knew Big Dog was he was getting gassed and wanted to save his energy for the offensive end.
I honestly couldn't tell you the last team we had that was decent at defending dribble penetration. Maybe it's something the Zips defensive strategy sets them up for.
A couple of defensive things I've noticed and would like to see modified. First, we trap the ballhandler every time on a high pick. We never switch it (until after the trap) or just play through the pick. As a result, we're vulnerable to a team that moves the ball finds the big man quickly coming off of the pick. Also, I don't recall seeing a second of zone this year. I'm not a bog fan of the zone, but It is something we ought to trot out occasionally, even for a couple of possessions, for a different look.