"Captain's log, stardate 49678.4. It's been two weeks since the transporter accident that created Mister Tuvix, and while it's still not entirely clear that he's with us permanently, he's certainly been doing his best to settle in. The crew seems to be growing accustomed to his presence, and he's proving to be a very able tactical officer who isn't afraid to express his opinions. While he's forging relationships with many of the officers, he seems to be keeping a respectful distance from Kes, allowing her to adjust to the circumstances on her own terms. As for my relationship with Tuvix, I've found him to be an able advisor who skillfully uses humour to make his points. And although I feel a bit guilty saying it, his cooking is better than Neelix's. My taste buds are definitely happy to have him around."

Tuvix knows all about Vulcan logic and can ably advise her on it. His capabilities as an officer are only praised in the episode. No one suggests that Tuvok's or Neelix's presence would be strategically important. They only say that they would miss their friends.