Perhaps the season four you watched took place in an alternate universe. He was ALWAYS a ladder climber. As i said, I just watched season four in the span of a week. Logan wasn't honest at the start, and you could tell pretty quick that, like Sherry, he was out for himself..still is in season eight.
And as for Dana? Have you been watching this show? You have to know by now that CTU always always always has an insider. I pegged her as an insider pretty early on.
So, sorry. I guess we are just watching two different shows...but Logan was and always has been a self serving prick. He even looks like Tricky Dick...