Do I need a new engine?

What is your question?

I have a 2010 Mazda 5 with 78,000 miles It had a loud rattling noise in the engine during acceleration. I took it to a mechanic and they said the timing chain was shot. They replaced the chain, the tensioner and the VVT (not sure if that is the same as the tensioner). They said the noise is still there and that the bearings were bad, causing metal shavings top appear in the oil and that I needed a new engine.