Theory for what the cliffhanger finale could be…

I know it seems a bit far-fetched but I’m kinda rooting for a development between Spencer and Potter’s mom. That being said… What if the S3 finale revolves around Spencer proposing or deciding he wants to marry/move in with the mother of his biological child?

I know everyone is saying that a biological parent could make an appearance or that Creddie might get engaged. But firstly, I can’t think of any valid reason to have Carly’s mom or Freddie’s dad appear. Secondly, Creddie getting engaged is not surprising enough since there’s this unspoken idea and assurance that they’re definitely endgame (that and Miranda said in an interview that their relationship trials are mostly about how they handle the people around them rather than themselves).

So what do you guys think about this theory? Would this be too far-fetched or does it seem possible?