I like all the guys left and I liked Graham too. I have no favorites in this season at all. It looks like, from screencaps, Jason is going to be the "winner". If he is then I hope that he and Deanna have a great and happy relationship.
However, I think that some of the Jason fans are reading a lot more into the relationship than has actually been shown. Jason is terrific. He's nice, caring, a good dad, etc. Again, I have nothing against him at all. But, as someone who is watching with no vested interest in who she chooses, I'm just not seeing as deep a connection as some people are.
Graham keeps coming up because the deepest connection we have been shown was to him. Now he is gone, maybe her connection with Jason will deepen. I think they have a good friendship up to this point so it's possible it could deepen and certainly even more in the time since filming ended. But, I think he has not been her favorite up to the Final 4. I am not denying a connection between them. It is definitely there. I just don't see it as a romantic connection up to this point.
Again, I hope that if she does indeed pick Jason, that a real romantic connection develops either before the end of the show or after the taping ends and I further hope that they take things very slowly and carefully for the sake of his son.