Alex himself has never been written as an A list character, and he is generally kept out of Limbo and not even really even mentioned as an X-Man. That's partially why a lot of Polaris fans are more interested in Lorna's status as Magneto's daughter, or as the sister to Quicksilver and the Scarlet Witch (whenever that retcon is undone). There are simply a lot more stories that can come from her being a member of Magneto's family. As for Lorna being more like him, well he's an A list character. Her being written more like him would help her a lot. Notice that all major characters from the X-Men that are huge are bad to some degree. Jean Grey, Magik, Wolverine, X-23, Sabretooth, Emma Frost, etc. The writers have more fun writing characters that are bad to some degree. Notice Lorna's last major push is when she went crazy and ruthless and was revealed to be Magneto's daughter.