So Soul Society wanted to keep tabs on Ichigo, even control him? Big deal. I hate to be the jerk who says this, but it's their right, or at least they're responsibility. Ichigo's an extremely rare and dangerous anomaly to them. He's walking around in the living world
spewing reiatsu around at the level of a captain! And to top it off, he's not exactly stable either. Let's not forget Hichigo. Sure, he should've earned their trust, but being wary is still smart. I would hope that Ichigo would be able to handle this news.