User blog comment:Dave55811/"Coordinate" bets, anyone?/@comment-101.167.123.164-20141229100551

No way is it the smiling titan, he was ripped to shreds by titans. Titans that EREN controlled when he activated the coordinate. We don't know if the coordinate is in his bloodline, he was randomly chosen or it may even be his key. But the most popular theory is that Erens father Grisha was the previous coordinate and when he died in the attack on wall maria(it is still unclear on whether he died or not) Eren gained the coordinate powers.