OK, time to show my ignorance...... Sadly, I have zero formal education on the subject, only some technical references I consider beyond reproach that in my ignorance I could very easily be misinterpreting, so by leakage current, are you referring to the cap's conductance due to the electrical circuit's capacitive reactance WRT frequency or......?

I've always taken for granted that 'conductance' means just that, (current/whatever) flow that can be a considerable percentage of the whole in a tweeter's XO BW if I'm understanding what I'm reading correctly.

GM