This list of diseases that are inflammatory in nature is huge. This is going to be a mega blockbuster and XOMA knows it. That is why it was so important for them to have the US market rights back. They signed a super deal. Develop the blockbuster with someone else's money then buy the rights back when it's money in the bank.
For all those that were whining about a lack of a partnership now you have a better understanding on how things work.