Your lucky it was only an incomplete alignment.

On the E70 "broken rear diff" thread, the youtube vid of the damaged diff has a comment that states "Hi I had this exact failure on my 4.8i E70 2007. i put in a differential with a gear ratio of 3,70 while oringal was 3,91. my vehicle couldn't work properly and goes in limp home mood. do you think changing ratios could be the cause or does the damage affect other parts?...."

That's a classic example of someone who thinks being able to turn a wrench makes them a BMW repair tech.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!