Green pancakes? I'm sure they were a surprise to all, but a nice shake up in the scheme of things.
Be careful what you discuss w/your SIL. Yes, your xh may not be a happy camper because of the situation that he has placed himself in, but he's the only one that can dig himself out. The ow apparently hasn't "performed" to her highest standard yet w/him. Maybe this is the way his own parents behaved when he was a child and he has to live the scenario out completely...
I'm glad he loved his gift. It was one the bright star in his day and it just might be a nice reminder of what he gave up.
Yes, we can feel sorry for them, but they are the ones that chose to leave and hook up w/op. No, you are not crazy to be concerned, but be careful that you do not allow this concern to soften your boundaries towards him. He has to face the consequences of his actions completely as he grows up.
Hang in there.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.