Aaron looked like he was about 3 or 4 with Kate at the end. Can we assume that the O6 will be leaving the island fairly shortly to allow for plotlines about getting back? If thats the case, it probably wouldn't take 4 years for Kate to have to face the music for her past.
So when did Aaron grow? Did he have a big growth spurt on the heliocopter as they were leaving the island?
I'm just trying to visualize what that would look like. Kate would probably be holding him the whole time on the way out. Would he just all of a sudden be 30 pounds heavier looking like a toddler hulk with all of his baby clothes torn?
i think the only logical explanation is that they were on the island until aaron got to be that age (which has to at least be another year). there's no way that they would wait a year or longer to bring kate to trial. OR they tried kate immediately after her return and the trial took a more than a year due to complications? i cannot see aaron growing all of a sudden after leaving the island (how ridiculous would that look?) otherwise, i'd consider this to be a pretty big continuity error.