What does Nitish Kumar's meeting with Om Prakash Chautala mean?

The recent statement of Janata Dal (United) leader, Upendra Kushwaha called Bihar CM Nitish Kumar 'PM Material'. His statement created a big blow in Bihar Politics. Now, the question has been raised, whether Nitish Kumar is actually aiming for PM's chair? Although, the leader has been time and again denied having any such desire.