Luke and Jyn are Rey's parents?

Ok, I know this is most likely just a theory, but I heard a rumor that Rey is supposed to be Luke and Jyn's daughter. Yeah, I know Jyn died in Rogue One, but the rumor is that at some point Jyn was on Tatoonie before A New Hope and had a one-night stand with Luke while he was in town, thus resulting in Rey.

Yeah, I know that Disney is likely not going to promote premarital sex or one-night stands, but I guess there is some plausibility to this theory. Basically it's been established that Rey is most likely either the daughter of Luke or Leia or granddaughter of Obi-Wan. Well, it's HIGHLY doubtful that Han or Leia would just abandon their daughter. Also, since Jedi are forbidden to have families, it's also highly unlikely that Obi-Wan had a child, let alone a granddaughter. Which leaves Luke. And since he's also a Jedi now, following the Jedi code, it's highly unlikely that he would have a child too, unless they were conceived before he became a Jedi (don't forget that Mara Jade is now non-canon).

Enter Jyn Erso. Is it really that hard to believe that two teenagers meet in a poor town, hit it off pretty well and decide to have some "fun". And, well, accidents happen, even with all the advanced technology in the Star Wars universe, otherwise Luke and Leia never would have been conceived at all. And with Jyn's background and loner lifestyle, she may not have felt she was a fit parent and so abandoned Rey on Jakku. Or maybe she just left her there to do a job and got roped into what happened in Rogue One, which is why she never went back for her.

Again, I know this is most likely just another wild theory, but does anyone have any thoughts on this. It would give more purpose to Jyn's character, and make Rogue One less of a cash grabber since it makes it more relevant to the Star Wars universe. After all, Jyn and Rey DO kind of look alike. Personally though, I disagree since Rey would be much older by the time The Force Awakens should begin.