About Sinclair and Delenn, yes, they were supposed to get involved. They already had a Minbari bonding ceremony in year 1! Also while I too believe the best ending would have been to have Sinclair go back in time and become Valen at the end of the show, the original storyline didn't work out this way. So I can imagine that JMS will try to rewrite everything as if the actor and studio changes did not happen, but I still don't like it, because he has shown with Crusade, that he didn't understand that the success of B5 was not only due to his writing, but also due to the fantastic CGI ships and music. I hope he understands now otherwise the reboot will be screwed!