Saru Underwent A Drastic Change
Saru spent a bulk of Star Trek: Discovery's run to date as a cautious and somewhat worrisome character. In Season 2 it was revealed that was due to ganglia on his neck, and that once it had fallen off, he was no longer a character consumed by fear. It was news to Saru, whose species had been groomed to believe Kelpians died when their ganglia were removed, and we saw a bit of a different side of him. Saru is one of the fastest and strongest people on the ship, so it will be interesting to see if he uses that now that he's not held hostage by his fear.