2009 mini cooper loose crank bolt

just swapped over the motor it cranks and has no start. Pulled my vehicle and took it to a mini specialist. The cams and chain not moving. I was told the motor is blown. The original mechanic wanted the vehicle back He has used a scope to show me there is no damage to any cylinder. He found the crank bolt loose by about 6 turns (this vehicle does not have a keyway) it is torqued. With it tightened hand cranked the timing chain and cams now move (without any abnormal sounds) He will be scoping today to rule out bent valves (any guesses or predictions)

 

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