Will the admaek fight with vitali be counted as madatory defence?

As far as I know, Adamek is ranked #1 and the current mandatory. But Stiverne will be mandatory after that. I think Vitali can have a voluntary defense in between Adamek and Stiverne. I think Dimitrenko would be a good choice. that would be a very exciting match (against Dimitrenko) that will undoubtedly end in a brutal KO of Dimitrenko