Except it's not just those pics. They weren't cherry picked, they were just the first two screencaps I ran across. Even though the show had tons of errors and inconsistencies, Astrotrain's bot mode isn't one of them. Shuttle mode is another matter... As Emgo says, it's your toy, do what you want. But I can't think of a time when he was ever shown a different size than a seeker or the other triple changers. Now the shuttle mode is all over the place, but to me that says it was the alt mode that resizes, not the bot mode. Not that that's unheard of - Megatron seems to be human or transformer sized at will, and Cyclonus did it too. Everybody calls Hoist riding in Huffer an animation error, but given that Bumblebee rode in Wheeljack in the first episode, I tend to think mass shifting alt modes is more or less an official, if unexplored thing. At the end of the day, I prefer to scale around bot mode (alt mode scaling is an exercise in futility) so I'm hoping my triple changers and seekers are the same size.