I also think he was Adam Lucas, and set that whole fake blind date thing up to watch Adrian at the table, and to test her reaction. If she had been feisty and handled being stood up by storming out of the restaurant, he would have read her as a strong woman who can't be controlled. She patiently sat there waiting and hoping. I think he saw her as an open target.
Yeah, I definitely think he was Adam Lucas for the blind date, but I think he did it as a way to catch her attention.
She was waiting for the blind date that never showed but she was looking at the man who called himself Jack.
When he showed up at her workplace, it was all a big coincidence that he was suddenly in her face after all that.
This is the sort of dramatic entrance into her life that can make memories for people who end up being a couple. I think this is what he was going for with the fake blind date. It was a funny story they took with them into their life for 'how they met' originally.