Plugin manager question

[tspco]

I just installed a plugin manager, (not sure which one if there are more than one)and I have a question. I made a special folder in the SU directory, I put some plugins in it, it seems to work fine, my SU start time is far better, and the rb in this folder don't even show their icons on the workspace until I load them, great! less clutter, more drawing room. I have one plugin however that left icons in the workspace, and even still worked when I clicked the start icon, what's up with that?, The plugin in question us Su2KT the Kerkythea exporter.
This is not a big issue but I am curious.