I disagree since Young Justice likes to do things and characters differently so, it is the perfect universe to have a red-sun planet with a bunch of Kryptonians to have available for the writers to use, either as a group or as individual characters. If Clark had centric stories then it would make more sense to keep him as the last son of Krypton because of how it relates to him, but since that's not the case, that status isn't really important and would just needlessly limit the stories and ideas that could be told and explored.