Commander Sinclair spent two years on Minbar before he returned to babylon 5 where he remet Captain John sheridan who seemed a little suspicious about him and Delen's relationship. Then they went off to where the energy signatures were coming from and then Sinclair found babylon 4 and asked Sherdian to not tell garibaldi that he was back and then sinclair became valen and garibaldi was upset after Zack Allan told him sinclair had come back but that he had missed him but he left him a message to his old friend. Im sorry guys i just couldn't finish this story i just don't have enough info on Sinclair but i will try and work on other Babylon 5 stories