Also, one of the really buggery problems in time travel, that no fiction has yet to really deal with, is the fact that the Earth is moving through space.
The spot the espressosourus left will be 6,350 miles further along its orbit around the sun and 43.179 degrees out-of-phase because of the Earth's rotation.
As you can tell, I'm not much of a Raven fan.
All motion is relative. I can think of reasons for the espressosaurus to move in lockstep with Earth. If that doesn't happen, I can't think of any reason for the espressosaurus to be at the same position in orbit relative to the sun, and the same position relative to the earth's surface (for the phase bit). Momentum and gravitational acceleration keep us in the same position relative to Earth. Mess with one of those and you don't just get out of phase, your position goes entirely wacky. There's no such thing as absolute 0 momentum, just a relative 0, but you can talk about absolute 0 gravity.
Earth's gravity is no longer a factor when you're opening a wormhole through time and space (during the journey itself).
I don't see any evidence that this is wormhole-based time travel, but if it were then Earth's gravity would absolutely be a factor, since wormholes are physical things which themselves travel through time in the normal fashion that we are doing right now, and they are subject to both gravity and momentum. A wormhole end generated at the coffee of doom (or wherever Raven got it from) has every reason to still be on Earth the next day.
Don't get me wrong, I agree that position is overlooked or elided all the time in time travel stories. But most statements about where something should come out just replace geocentrism for heliocentrism, which in the context of people using time travel technology is still a hopelessly outdated model.
I do like Raven stories.