Tiguan :: 2011 - While Driving On Highway Car Shaking If Goes Above 40 MPH And CEL On

I have 2011 Tiguan SE 4motion,that i purchased 5 months ago just got out of warranty

First problem i had with this car was the failed Ignition coil on one cylinder one month ago,suddenly while driving on the high way the car was shaking if goes above 40 MPH and check engine light came on, I continued to drive slowly till i made it home , and changed coil the next day and everything was fine for few weeks , i was planning on changing the rest of the coils and spark plugs.

Recently after leaving work i tried to start the car and it won't start it made weird loud crank noise but no start, check engine light came on , showed multiple cylinder mis fire code and random mis fire code

I changed remaining coils and spark plugs just to see if it will fix the problem ,it wouldn't start. Towed it to my regular mechanic after few failed attempt to start it he checks compression and was non on any cylinder, I researched online and came across common complaints of Timing chain Tensioner Failures and i thought it has to be same problem with my car.

Mechanic removed the timing chain cover to see if chain slipped or tensioner failed and they were fine and everything is in place with no timing fault, I checked the tensioner myself yesterday with him and still working fine. Now we deciding on opening the engine and check for damage Or just Replacing with used engine.

Having situation of engine failure WITHOUT having the timing chain fail due to tensioner failure? The misfires that occurred 1 month earlier could have caused enough damage that went catastrophic a month later? I had oil changed by mechanic with recommended Mobil one oil for VW 4 months ago...