Now the question about the theory, which is after all just a theory, that Ed was lured back though he wasn't interested then why did he win.
Well if the producers knew Jillian had her heart already set on Ed - she said she got drunk and cried all night when he left, they would not be above tricking Ed to come back to make Jillian happy so they got a happy ending to the show.
There is some suggestion that Ed made himself a pain in the butt on set so theoretically they could have killed 2 birds with one stone, payback and guaranteeing themselves a happy Bachelorette and happy ending. People in the entertainment business can be quite spiteful.
If it did not work out, they could care less. Ed may be in a very difficult situation. If he breaks it off now, he admits to being a cad and/or he gets in trouble with the show, maybe he cares enough about Jillian to not want to hurt her and/or he is giving it a go or wants her to do the breaking off. Or he did fall in love when he came back. Or it was true love all along and they will live happily ever after, or at least the average life span of a marriage these days.