Why would independence make any difference whatsoever?
Blackpool is independent.
Not a great record for incidents over the years, couple of coaster deaths, the odd broken back, many minor shunt accidents...always completely avoidable if procedures are followed competently.
Likewise Lightwater.
Not a good safety record despite independance.
And I too would have challenged your final comment.
When any accident happens in the future...you can always scream..."See I was right all along."
If it were just independents with issues fair play merlin have more incidents to think about other than the smiler, Legoland crash, thirteen i recall had an incident in its early years , Disney have had major issues at times,