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Question: Current engine problems correlated to previous problems?

Hello,
I have a 2010 x5 4.8i, we purchased the vehicle used from a bmw dealer and continued our vehicle maintenance there as well. About 2 weeks after purchasing the vehicle we had a low oil sensor light come on followed by black smoke coming out the exhaust. They figured out and fixed several leaking engine oil/alternater and coolant valves, gaskets, o-rings, and cowl trim. Several months later we get a oil sensor malfunction message on the dashboard, I take it in for oil change and to check error code. They say can't figure out code but you can continue driving vehicle and when you come back for next oil change we'll look into it further. Less than a month later driving down hwy, vehicle engine bogs down and knocking noise is heard from engine. Get vehicle towed to bmw, say a bearing was bad and got metal shavings in oil and destroyed the entire engine. My question to you is if any of those past problems are correlated to the bearing problem and why there were no warning signs. Thanks!