Once the belt is removed you could spin one cam gear 500 times by itself and the oil pump sprocket a billion times. As long as the timing mark are lined up afterward, everything is okay. That is the entire point of the timing marks. They keep everything in check.

Marking the belt lets you know exactly which tooth was where on the gears. Trust me it makes sense when you start putting ti back together again.

The reason I said get a new tensioner is because you said it was out of spec.

Maybe one of your pulleys froze up or something. I really don't know what to tell you. I have never ever heard of anything like this before. I can only imagine something inside the engine in FUBAR.