Apologies if this has already been addressed.
I just finished up the quest where you go through Kellogg's old memories to find the location of the Institute and in the memory where Kellogg takes Shaun from Vault 111, if you activate Kellogg himself or your cryopod (I can't remember which) he makes a statement to the effect of "I wonder if the old man knew what he was getting himself into when I took the kid).
That struck me as extremely odd, because when you are going through the memories, any time you activate one of the characters or objects, Kellogg speaks but he speaks as though he is alive in that exact moment. In other words, these aren't ruminations that Kellogg had at the moment he was experiencing those life events, but rather his commentary on the memories as though he were alive and with you. Furthermore, Kellogg references "the old man" at least twice. Once in the aforementioned memory and then again when he is living in Diamond City with synth Shaun at his side. The key is: he uses the term in a way that makes it seem like he is talking about the same person. He doesn't really seem to mark the difference between the old man he references when taking Shaun from the vault and the old man he references when sitting in his home at Diamond City. This implies, at the very least, that the person who is running the Institute when he kidnaps Shaun and when you meet him (the supposed) 60 years later are the SAME person. This would completely invalidate the theory that Shaun = Father.
My working theory at this point is we are going to see a DLC down the road where we learn that the real Shaun is still alive and cryogenically frozen in some separate facility. I think this for two reasons.
1. It would be a huge mind f--- and would easily propel the somewhat tepid story into the stratosphere. It would make the DLC a must own, so that's easy revenue, and, most importantly, it would work well with the ending of the main quest, no matter how you chose to play things out. If you left the Institute intact, it would be the perfect opportunity to turn on them for being psychopaths and if you blew them up, this serves as further vindication for that choice.
2. It would give the story a more unified and cathartic ending. Finding Shaun, aka "Father", did not feel like a particularly memorable event. In fact, the moment when you finally confront him was almost a little too predictable. I remember reading on the forums very early that the safest bet was that Shaun would survive and would become the anti-version of you. Making him the leader of the Institute just seems too obvious and too contrived. Plus, as many have pointed out, there seems to be something "off" about the Institute as a whole. No one ever justifies why they are making synths (besides we can), no one ever really scrutinizes why they would abduct just the child, when that whole vault was technically a source of DNA (plus one would think having more diverse samples would be a good idea; what if Shaun had some congenital disorder), and many other head scratching things besides. The motivations for the Railroad make sense, the motivations for the Brotherhood make sense, but the Institute always seemed to be masking some ulterior motive.
Releasing a major story themed DLC that took our perceptions and flipped them on their head would be AMAZING. It would, I think, seal up a lot of suspicions I have and could serve to reintroduce the Institute as a threat and could rebalance the scales in terms of the overworld population. For instance, the Institute is revealed as being a much larger organization that is trying to replace all life with this synthetic version and Father was really just a shrewd, psychotic old man who was in charge of the Commonwealth chapter. With the destruction of the facility under CIT, the Institute marshals its full strength and focuses it to come after you, and you have to rally your faction of choice to fight back. If you destroyed the Brotherhood, they make a reappearance in the DLC with a greater presence as well, in the hopes of getting revenge for their fallen bretheren. In other words, complete cluster f---.
Sorry my discussion got away from me, I meant to keep that concise and controlled. I just got really excited by the idea. What do you guys think?