Six,
INT does make a different for the mages - maximum spell level and number of spells per level can matter. Ever want to cast level 9 spells? Tough, unless you're a mage yourself.
Want someone you can actually wield the best weapons with the best ability - you need to use a fighter PC.
What exactly do you want this NPC thief to be able to do? The way the theif skills are organised means that you're never going to a get a single thief you is good at locks, pockets, traps and stealth. Unless thieving is a large part of your game (then why not BE a thief) surely the ability to detect traps and pick locks are the ones to concentrate on. My own Thief is an Assassin, but the low skill levels means that he needs a backup thief (someone to detect traps) so that he can excel in his chosen profession. This is much more so than BG1 due to the greater number of skills to spread those points around.
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