Kosiniak-Kamysz as Tusk's successor? Summer rumour or real possibility?

Polish media are speculating about who might succeed Donald Tusk as prime minister. Analysts point to Władysław Kosiniak-Kamysz, PSL leader and deputy PM, as holding the most equal-footing relationship with Tusk among the coalition's younger generation of politicians. Tusk is said to have deliberately avoided grooming successors within his own party.