Kirk: I have another way to explain.... You start watching the original Star Wars. You watch up to the Cantina when Greedo takes his gun out and has Han sit back down in the booth. Now, your buddy turns 'A New Hope' off and throws in 'Empire Strikes Back' right after Han is frozen in carbonite. At this point, you say "Greedo turned Han into stone and killed him!?! Han's arc is ruined!!!" Of course, we both know that's not the way things pan out. And this is exactly your reaction at the moment to Londo's arc. A lot happens in the next 2+ years.