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
Uh, Lisa, the whole reason we have elected officials is so we don't have to think all the time. Just like that rainforest scare a few years back: our officials saw there was a problem and they fixed it, didn't they? — Homer Simpson
