Okay, there has been a resurgence of the nasty speculation that (and I'm using spoiler tags even though it's not really a spoiler just to be safe) :
<!--SPOILER BEGIN--><div onClick="openClose('813e82e4603e95f55084e9ae6767d44a')" style="font-weight: bold">Click For Spoiler</div><div id="813e82e4603e95f55084e9ae6767d44a" style="display:none"><!--SPOILER END--> Sloane is actually Syd's father <!--SPOILER DIV--></div><!--SPOILER DIV-->
Yes, I know, this has been floating around since 1.1, but it's been growing in popularity lately and it's rather upsetting.
I feel so bad for our fav spy-daddy! He is, despite his own opinion of himself, a very good father. He might not be the world's most affectionate parent, but he always has Syd's best interest at heart, and his life's occupation seems to be keeping her safe from whatever new person/group/mystical force might be threatening her.
Plus I'm a big fan of 'the guy mentionned in the spoiler.' No, I'm not all like "go evil people, yay!" but I really like that character. And if this ridiculous speculation turns out to be true (shudder) than I will loose much of the affection have for 'the guy mentionned in the spoiler.'
Either way, this would not be good for Syd (duh), 'spoiler guy' (in the character's mind yes, but not good for his character itself), and poor Jack.
Don't worry spy daddy, you'll always be the only patriarchal figure for us!