The Collector observed that the carrier unit known as 'Thokk' to ensure that the specimen fulfilled its purpose properly. It did not create further mental hints to navigate the unit back to the main Holding Bay and it dropped off the unit some distance away from the bay intentionally.
This was so that the Collector could see whether the unit was capable of navigating the fortress utilizing only the layout of the fortress implanted into it. The carrier unit met the Collector's basic expectations and quickly navigated his way through a few intestinal pathways, warping three times to different locations of the ship as he jumped his way down to the main Holding Bay.
The unit only had to stop five times to pause and collect his thoughts, indicating a degree of familiarity with the fortress that would only improve over time, with an estimated three days of movement across the fortress granting the unit nearly complete innate knowledge of the fortress.