WOW, really? 8 months no playing and then this? Ok, am not a piano specialist, but you seem to know you way around the keys :) I guess piano playing is like the ability to ride a bike: Once we know how to do it, we'll never unlearn anymore. That said: Piano is all about the flexibilities in the hands and fingers, something that can easily deteriorate I suppose.

You mean you are the teacher for the face-2-face classes, right? Can't imagine you will be one of the students :)