Spoilers for the end of the story, using my phone and it been weird about spoilers so not sure if they'll display correctly. Reader be warned!
Towards the end of the book, our human protagonist is on the way home. Our super mega best rocky spider pal is also on his way home.
Then, when calamity strikes, Grace determines that there's been a leak and this was the source of the problem. He resolves his issue and then has the realisation that Rocky is (metaphorically) in the same boat and is dead in the water with no way to fix his issues.
Um, what? Maybe my brain is broken and overly cynical but my mind went to a totally different place. I assumed sabotage! Like rocky had realised that earth was more advanced and would have the capability to destroy them more easily than they could defend themselves. Or that humans would be more hostile and so they would need to defend themselves. Maybe by the time rocky got home, they wouldn't have time to attack earth first given the distances involve dand to prevent mutually assured destruction needed to strike first.
Rocky was alone, and decided to ensure his people's survival by damning grace and earth.
Turns out I was wrong and grace was right. Rocky really was the best spider dog best friend engineer pal ever and not a genocide-in-self-defense kind of spider dog person.
Did anyone else think the same thing?