You could say the post defense isn't doing very well, but...

You could say the post defense isn't doing very well, but maybe his teammate isn't dropping down for a double-team, or maybe the person guarding the ball isn't pressuring the ball. It's tough to pass into the post if you're pressuring the ball. There could be three or four things wrong, and usually are. You need to be accountable and help each other be accountable.