Kosh said he had to wear his encounter suit, or everyone would recognise him. When he left it to save Sheridan at the end of Season 1, many races saw him as an angelic being. However, after the original Kosh died and was replaced as Vorlon Ambassador on Babylon 5 and Sheridan devised to get rid of it, we saw both Vorlons in a completely different form - almost octopoid. Question is, why did we not see them as angelic beings when the Vorlons were fighting? Is it because the Vorlons were purposely trying to look appealing in angleic form and that it took effort, and that Kosh made every effort to create an impact when he saved Sheridan?