Yes, that's what I'm seeing and understanding. Thanks for your input. I was hoping to bring this to the dev's attention, because by default I would assume it behaves differently, so I'm not sure if this is intentional or not.
Another potential issue is if you get the crystal upgrade without preparing you can get trapped with T1's you'll never be able to upgrade ... which granted is only an issue for those who really push the game to it's limits but it's still a potential issue
Oh that's true. In other merge games you're usually able to delete those, or they're automatically upgraded to the next tier when that happens. Good catch! Hope the dev sees this and updates the game. I love this game!