Yes, the short ratio is lower than it's been in approximately forever.
Do we know it's Einhorn that has covered? No. Personally, I hope he has NOT, lol. The little twerp deserves to ride his short into oblivion.
Now, as to wanting more institutional buying...do you have any idea what the current institutional ownership of GMCR shares actually is? Go look it up. There has been no shyness on the part of institutions to hold this stock!