location, location, location
...or should that be connection, connection, connection????
I've never practiced blindfolded, however I have practiced with a unsighted partner. And learned VERY quickly that the role did not matter; if I allowed there to be any break in physical connectionl I'd pay for it at once with some kind of atemi.
So, in the absence of a blind partner to play with, perhaps some blindfolded practice could bring home very concretely (BAM!) the need to keep a good connection at all times.