If we're discussing worst owner in the NFL....that's Jerry Jones in Dallas.
He's had a LOT of talent over the years but out of sheer narcissistic control freakism, he's won exactly as many games has he's lost since 1997.
And, though he acknowledges that HE'S part of the problem, he refuses to get out of the way.
Jerry is at least committed to winning. Unfortunately he is too hands on and can't get out of the way because of his ego and it causes dysfunction within the organization.