And There All Honor Lies is a bit meh episode (I like the subplot though), but And Now for a Word is a great experiment and In the Shadow of Z'ha'dum is possibly the most crucial episode of S2 for the overall arc. After that, with the exception of the average Knives (which still has great Londo material) and the messy Divided Loyalties (which is still very important in the overall scheme), the rest of S2 after that is all excellent stuff.
ITSOZ being focused on wether a supposedly dead person is alive or not
Ah, but see, that isn't what it's about. There's no doubt about it; Morden is alive, 100% living, not dead, mortal. The episode is about what it MEANS that this man, who was thought to have died years ago, is alive, both on a very personal level for one of the main character's and on a much grander level that affects the entire fabric of the show's mythology.