Q2: Yes there is a window where the lord can activate before he is attached to the location.
Are you sure about this?
"As soon as you gather three Keys (Keys are gained when you recruit a Lord with a Key symbol or by fighting a Monster while Exploration) you must immediately take control of a Location."
"Any Lords used to control that Location must be slid underneath it so that their Powers are covered—these Powers are no longer available for the rest of the game."
The above suggests otherwise.