I get the feeling that Tripp wasn't so innocent or surprised to the fact that Steve is his father.
I was glad Adrianne chose Lucas only because it took the cockiness out Justin. To see the shock on his face when she told him why, and also knock him down a peg or two.
On the other hand, I was disappointed because I think Lucas and Anne would have provided a fantastically humorous flair to the otherwise depressing story segments for the past few years. We, as fans and loyal viewers, need to laugh a bit and have a positive reason to tune in the next day.