I have no idea why Magnus thought Alec was different for a Lightwood! He has the same lack of seduction actions as his ancestors: which is 0%
- Gideon hid scones to attracted the girl he loved
- Gabriel rated Cecily as 5 in training without even knowing her
- Christopher stumbled while dancing with a girl
- And Alec fell off the stairs after kissing the guy he liked!
See? Alec is a perfect Lightwood!