From what we know of him, he won't wait until he knows the full picture before making a decision... This pattern has repeated itself many times before...What we know of MC so far, he will run away without listening what Alexis say make situation worse and worse then when someone manage to explain things to him, he'll say how stupid he is etc.
Btw, Nyx said there won't be a incest but this does not mean there wasn't, right? Maybe Santi and Emily are siblings, would explain many things about MC.
And yeah there might something be weird with his genes lol.