I'm glad he's back. This makes me wonder more about Kaver. Is he out there, is he alive, did he try and come back last year, did A & B chase him out? Unless he tries to come back this year, I'm afraid we'll never know. It's not getting any easier missing Kaver, it's getting worse. Now my concerns are on Mariah, what the heck will happen this season?
I am sorry to say I think something happened to him.

Remember right after he disappeared at the end of 2008, Mariah was hanging out in all the places Kaver usually did where she didn't usually go. Also they did no pair bonding (that we could see) before he vanished. I think she was looking for him. I really don't think he would have left her for another female. He didn't come back because he couldn't. I wish I was wrong but that is the way I feel. I miss him. He was the best.
Now I am conflicted. I want Mariah to come back but I am also afraid she will (and get hurt again). is there a smilie biting his nails all worried?