No, not even long time fans I think saw this coming! That was totally from left field! I mean all we saw of Paul Crane was that he was one of the jugglers directing President Logan on what to do! But that's it, nothing to even hint that he was Jack's brother.
I have watched every season and I was still like holy **** when Jack called him. My wife had forgotten who the guy was from last season so she didn't understand why I was freaking out about it.