he is the only one who really knows her, who knows who she is, why she does what and just her true self....and loves her for that...even claude...her "father"...doesn`t know her....he only ever saw her "acting"...and cared for that role she played...she became more relaxed later on in their relationship before the whole memory loss thing...but still....so yes...he will be the only one in my opinion whose 'hurt' over her would really matter...
That's why I said he will suffer the most...and I feel also suffer because I love his character so much
Will*
I feel bad for Lucas...I know that if something bad happens he will suffer the most because he loves her...(ofcourse every else will like Jennette,Claude,Felix and Lily) but still I feel that he will be in the most pain