That presupposes two things that don't work on the 2000 4.0L:
(1) You need to remove a spark plug to feel if #1 is coming up on compression or exhaust; and
(2) You have to be able to see the timing marks on the front of the engine.
I'm old enough to have grown up with points and condensers and actually setting the timing every time we did a "tune-up." Which, back then, we did every 10,000 miles. I know what the timing marks look like -- and they aren't visible on the 2000 XJ. And I don't feel like fighting the idiot coil rail a second time just to pull ONE spark plug so I can feel for compression while I crank.
I was hoping you would tell me that Jeep thought about this and made provision for it. I guess not.
I'd say sorry, but I wasn't the engineer at Chrysler who did the design and layout of the 4.0L. I didn't day that this diagnosis would be effortless. This is a Chrysler-made product, afterall.
If you remove the aux. fan, you can shine a flashlight at a certain angle and get a glimpse of the timing mark. With the help of a fold-able mirror, it becomes a trivial task. As for determining if the #1 cylinder is at the top of the compression or exhaust stroke...if your alignment hole in the cam sensor looks to be 180 degrees out, then you're most likely on the incorrect stroke - spin the crank around another turn and you'll be there.
Chrysler "modified" the layout (I'd use an F word myself)