How to modify app expose to show only open windows of current application on current desktop?
^ + ↓ will show all the windows of the current app regardless of their desktop (without overlapping)

And if you want to show all the windows(can be of diff apps) of your current desktop without overlapping then uncheck the Group windows by applicaiton check box and your mission control will not overlap the windows

P.S. I have 10.9.4 installed.