Evidence of, to begin with, stalking? Identity of the guy?
Multiple flat tires within a month - one one night and two another night after she left a nightclub.
Casey told one of her friends that she thought someone was tampering with her car.
The gas gauge possibly not working - it needs to be tested to see if this is true or not. Stalkers have been known to siphon gas from their victim's cars in order to put them in a situation where they need to be rescued or to control their movements.
The big emotional incident at the "Anything but Clothes" party in May where Casey disappeared for an hour and had been crying - she told others that she had a miscarriage with a guy at the party - but she lies so much, why would we believe she told the truth about the cause of her being so terribly upset that night? What if she was threatened by someone there?
Casey desperately gloming onto any male - moving in with TL - could she have been hiding from someone? She seemed to be splitting off with her original core group of friends and moving into a new circle - her old circle didn't even know where Casey was living.
Being nervous about her or Annie sitting near the window in the house when Annie visited her.
The defense can also use the fact that Casey didn't flee when she had multiple opportunities to do so as an indication that she really was trying to get Caylee back from someone.
See, the thing is, the evidence CAN be spun in multiple directions, not just the direction that the Prosecution has taken it.
As to the identity of the guy - it could be anyone - the defense is not required to identify him or prove that he did anything. The job of the defense is to force the prosecution to prove their case. Honestly, with the stuff that has been released so far, I'm not convinced they have enough to win a conviction. I hope they have more and stronger evidence. Hopefully they do. But we won't know until the trial.