Robin Gardiner theory is an interesting one. After the Olympic was badly damaged from the
HMS Hawke accident 20 September 1911.
They could not get an insurance claim and the kneel was bent!
The plan was the switch the two ships as the Titanic, and sink her to claim the insurance money! The Californian was part of the plan were she rescue the passengers and crew members. But the time factor made it impossible to do the change over! O though the two ships were sisters, but they were many changes made between two of them and well documentary in books.
Titanic is to fire distress rockets hay presto Californian would be there for the rescue. We all know what happen to that theory?
I believe Gardiner stuck to his story until his death.