lots of people are saying they dont think Irina would cheat on Jack with Sloan. Believe it or not, i am MORE surprised by the idea that Sloan would cheat on Emily! Say what you want about the man, but you can hardly say that he is not truely in love with her. he was willing to give up his 30 year obsession with Rambaldi for her!
I still like Milo's theory about Sark being their child, i just found this idea or Sloan's faithfullness interesting