If you're referring to the scene between Kosh and Sinclair in "The Gathering", (Kosh's greeting) that wasn't in the original airing. It was inserted by JMS after the series ended. And I myself think Season 1 was the best of all. It set the stage of everything that came later.
I don't think it should have been inserted. One of the things I like about Season 1 (And don't get me wrong, I do enjoy the season but it's not as good as Seasons 2-4) is the mystery surrounding Sinclair and why the Minbari surrendered. To insert that line takes a little bit away from that mystery in episodes like And the Sky Full of Stars, doesn't it. Of course having known the series already, it's not much of a spoiler, but I'm just not sure it was wise to reveal everything right up front like that.
How can anyone who hasn't seen the Series yet, possibly remember those couple "made up" words spoken early in the Pilot, with no clue what the words mean, spoil something 3 1/2 years down the line in episodes? Nah, those words mean nothing, until you see it all played out 3 seasons later.
One Day I hope to be the Man my Cat thinks I am
Where are we going? And why are we in this Handbasket?