Because Ace is just the alter-ego of Nic, who is the alter-ego of Alex, and Jace is the alter-ego of Jason, who is Alex's little brother. Being alter-ego's, they're way too similar but way too different from each other at the same time. I don't know how else to explain it...
I'm never what I like I'm double sided And I just can't hide I kind of like it When I make you cry 'Cause I'm twisted up, twisted up Inside
“Rise like Lions after slumber
In unvanquishable number.
Shake your chains to earth like dew
Which in sleep had fallen on you—
Ye are many—they are few.” — Mary Shelly
