I took some time to experiment with it, and unless I'm making some sort of oversight, I haven't come across anything that fixes it.
Viewing post in [ANSWERED] Issue in Battle Screen (Visu Battle Core)
They are incompatible then. If you say you checked every plugin parameter and they do not have any option that can disable the changes on the battler image... Since Visustella plugin is obfuscated, there is nothing else I can do. The solution would be me look at both codes and make an exception so the Visustella plugin does not mess with the battler image/code logic. But, I can't see the code...