Suggestion
As stated in the title.
Or add something to help tell them apart.
Example: Add an indicator like A–D depending on the type.
Or make the background color of 10★ towers red, etc.
Current Status
Currently, the icon shows the final monster, but having to go out of your way to check the tower details just to tell apart the 8★, 8★, 9★, 9★, 10★ featured interception monsters in each period from a 10★ tower is a hassle.