you are right :)
Ezra is definitely Board Shorts, as it was confirmed by him when Spencer questioned him about his beer brand- Board Shorts. But who is Beach Hottie? Ezra is not Ali's Beach Hottie, as they had a sexual relationship and Ezra denied that he and Ali ever went that far. Only Ali knows, and the Liars are yet to ask her who her Hottie is. It could be Wilden, and he is the most likely suspect. There is the possibility that it is Wren, or even Holbrook. I personally think that it is someone else who was possibly at Cape May. Ian. I can't remember this theory ever being brought up, and everyone forgot about Ian, which makes him a likely suspect.
Ian and Ezra never had a sexual relationship with her, they both denied it.
I don't think its Wren. She may have known him before but not like that. Since she has mentioned she knew a doctor.
Holbrook or Wilden for me. Holbrook seemed to recognize her voice immediately, well he may have watched videos of her but I'd like to believe there's more. And Wilden , who is top suspect, given to his Ali obssession. He was so invested in her murder investigation. Obssessed you can say! This ties in with his obssession with the girls, Hanna especially! He accused her of stealing Ali's identity. Walking, dressing, and talking the same as her. Implying Hanna hurt Ali to take her place, or BECOME HER! He made her "the new Ali" in his eyes. He made random calls to the Marin house and questioned the girls illegally. He was always staring at her, making little remarks that only apply to Hanna and her mother. Don't forget Wilden has a violent nature and we have seen him lash out at times. This is also an explanation of why he was on the A team, to find her!
I have to give credit to the user who found some of it.