one thing to consider is how do/will Keller fit into the new offense. One could argue that he fits in Martys offense better then any other offense we have had before.
If Sporano was coming back then I would definitely not pay for him. He was a bad fit for that.
I think he tests the market but in the end may end up coming back. I think his agent is going to ask to much but the value wont be there.
Remember we tried to workout a deal before the year began but nothing developed.