Dude, you're not making it complicated - it IS complicated. It's a DOHC even-fire V6 - crank throws are 120 degrees apart - but the vee angle is 75 degrees so there's some trickery with cam timing. It will give you a headache if you think about it too much.

Two things you DON'T need to worry about: First of all, don't worry about whether #2 was on compression stroke or exhaust. All you have to do is make sure #2 is at TDC then by making sure the cams are lined up properly YOU determine that #2 is on the compression stroke and its partner #5 is at TDC on exhaust stroke. Second don't worry about whether you did it Bart's way or the Isuzu way. The Isuzu way most definitely works. (They designed the thing so it oughta!) Bart's way works too. Plenty of people have proven that. I have no idea HOW since he has the cams lined up as if #2 were at TDC but his crank is actually turned so it's half way between #3 and #4's TDC. I guess an engineer could explain it based on number of teeth on the cam gears, number of belt teeth between pulleys, etc - or maybe it's just a combination of luck and a wasted spark ignition - but either way - by logic or by luck - it works.

Two things you DO need to worry about: First, after you installed the belt, did you do like the manual says and turn the engine by hand through at least two complete crank revolutions, making sure there was no resistance? If you did, then you probably won't have to replace any valves. If you didn't then ahhhh... you may have just settled the debate about whether the 6VE1 is an interference engine or not. Second, in your TSB summary you said rotate the driver side pulley "until it points 90 degrees to the left of the alignment mark" but when you did this, did it spring into place (like the passenger side did) before you turned it 90 degrees CW? If not, then there's your problem! You have to rotate BOTH of them enough turns that they spring into place, then you turn the even bank cam pulley (drivers side) 90 degrees more before you put the clamp on.