I was thinking about that too. Lord Lysander will search for his relatives and learn about his brother Robert, who remained on Enroth, from Sephinroth. Then he will start looking for a way back. In this endeavor, he will be joined by some well-known heroes (Sandro, Yog, Crag Hack, and others), and they will return to Enroth, with some of them staying there and participating in the campaigns of the fifth game.
That makes perfect sense.
