His or his being in the team or being the best player

Hi. Which is correct? Also would you consider the underlined part in sentence 2 an absolute phrase or clause? Thank you for your help in advance.

1. There were three major players on the team, with John Doe being the best player.
2. There were three major players on the team, John Doe being the best player.
3. There were three major players on the team, him being the best player.

How about these? Which is correct?

1. His being in the team has been a major factor in their winning the championship.
2. Him being in the team has been a major factor in them winning the championship.
3. Him being in the team has been a major factor in their winning the championship.