Kevin Sullivan/Owen Hart...?

1. Kevin Sullivan was a wrestler, starting in the early 80s, in Georgia. At one time, he was saying that Satan was his manager and became a very violent heel in the Florida area, teaming with Mark Lewin and Jake Roberts, and feuded with Mike Grahmn and Dusty Rhodes. He formed the Varsity club with Rotunda and Ric Steiner, and often feuded with Hulk Hogan and Sting. He became booker and head booker at WCW, and was indirectly responsible for the losses of Eddy Gurrerro, Perry Saturn, Chris Benoit, and Dean Malenko to WWF. Once married to Nancy (aka fallen angel and Woman), and was divorced to her.

2.Owen Hart has been left out of the HOF because of the litigation between WWE and Martha, his wife. His wife has blamed WWE and Vince MacMahon for her husband's death, and as long as she continued to denounce it, it would be wrong for WWe to place him there.

1) Kevin Sullivan is a pretty old-school wrestler. I personally never thought he was that good, but he did have some memorable feuds. He fought Dusty Rhodes a number of times, and might be best known for starting the stable "The Varsity Club" with Rick Steiner and Mike Rotunda (aka, the I.R.S. Man). He later became well known as the booker (man who sets up the matches) for WCW. He was often criticized.

2) Owen Hart is likely not in the Hall of Fame because widow, Martha, became infuriated with the WWF after his death. She sued McMahon and Titan Sports, published a book about the incident, and publically belittled the federation a number of times.

I can't think of another reason. Because otherwise, he's a former IC Champion, Four time tag-team champion, European champion, King of the Ring, and one of the best technical wrestlers there ever was.

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Edit: To respond to your amended question...

It's not that Vince needs to "look past" Martha... it's not that Vince is mad that Martha sued him. It's that it would be disrespectful and against Martha's wishes to do so.

1) Kevin Sullivan is a former booker/wrestler, most famous for his stints in WCW. He is also the former husband of Nancy Benoit

2) Probably because Owens wife still hasn't forgiven WWE/Vince McMahon for how Owen died. Apparently Owen turned down a storyline that he didn't like so they made him the Blue blazer, which involved an entrance to the ceiling. Owen was afraid of heights and didn't want to do it, but the company made him do it anyway.