Hope everyone's having a great day

Just have a couple of questions about kits and how to equip them. Some of them might be more subjective to playing style than others, but any input you may have would be appreciated.
1) Is the Assassin kit bugged? By AD&D definition, shouldn't Assassins have an alignment no greater than Chaotic Neutral. My impression is that murder is wrong regardless of the cause, so why is it possible to create for example a Lawful Neutral or Neutral Good Assassin?
2) For a Kensai, would it not make more sense to maximize Single Weapon Style as opposed to Dual Wield? Since this character is strapped for AC options, doesn't the ability to lower AC by 2 initially plus double the chances for a critical hit seem more attractive?
3) Another Assassin question. Wouldn't it make sense to allow them to specialize in a weapon and/or weapon style? I know if I was a "efficient killer trained in the art of murder" I would probably rely upon or prefer a certain weapon or style as opposed to learning how to use many different weapon types!
4) Is the Thief stronghold as much a pain in the butt to manage post-patches as it was previously? If so, it's the reason I hold off on playing a thief class!
5) How do you build a party around a Ranger class character? They suck as leaders if you roleplay them (no metal armour because of Stealth so average AC), so that means you pretty much need to take Keldorn or Korgan depending on alignment, but after that?
6) AI On or Off? From a roleplaying perspective I would like to keep it on so the NPC's show a little 'autonomy' but realistically I'm always turning it off since they always seem to do some REALLY stupid things!
I guess that's it for now, or at least until I think about some other things that have been bugging me

Thanks for listening,
ElvenKing