Lanefan
Victoria Rules
I think it's one of two things: either a) the designers just didn't think about "what comes next" after Kalarel goes down, or b) they did, and it got cut for space. Given the layout of the last encounter, I strongly suspect b.I agree, these are some pretty glaringly big errors. But I didn't write the module. I can only assume the designers didn't believe those elements were relevant to anyone roleplaying in that situation.
Looking back on your posts, I'm starting to wonder if you're (erroneously) interchanging the following two concepts:
1. Changing basic game rules on the fly
2. Changing elements in a canned module on the fly.
If I change basic rules on the fly with no warning or discussion (oh, by the way, longsword only does d6 damage now) that's bad. If I do it only to give my monsters an advantage, that's best defined as cheating.
But if I change something in a module on the fly (let's say in KotS that if you defeat the Thing, the portal changes destination and can now get you to an alternate prime material instead of the Shadowfell; I as DM have decided it was the Thing's presence that was keeping the Shadowfell connection open) then from the players' perspective what's the difference? They don't, or most certainly shouldn't, know how it worked in the first place; and I just cannot understand why you think it should matter (or why or how it is "cheating") if I've decided at the last minute - improvising in response to their decision to try and go through - to tweak it into something more than the written module gives me.
Lan-"some things baffle me more than others"-efan