I'll go with Panetta as far as 'Putin knows something'. Clearly he does.
And two days have passed and I've not yet read a single piece of MSM reportage on his offer to share info on the 400 million in laundered money supposedly donated to Clinton from Russian sources. Not one word.
Putin knows something but not about Trump. Trump lived his life in the public eye and whatever unsavory things he did, or things some people regard as unsavory, are all well known. I cannot imagine Putin knowing anything that could intimidate Trump.
Hillary, on the other hand, is a different story. We know she is a ruthless witch but Putin's operatives may have found something more. There is much to find. Putin expected her to be elected and he definitely has dirt on her.