Let's look at a few things here and then consider what has happened in the past.
Both of the companies concerned would easily pass any safety audit in terms of their systems, SMS etc.
Neither helicopter company would have systemic issues contributing to either of these fatal accidents. The oil company just wouldn't contract companies that they thought would in any way impact their safety.
(Any training or fleet management issue which may or may not pertain to the EC225 ditching could and will be easily rectified)
Both of the companies have excellent records.
Empirically, unless either operator has a history of audit failures (they don't) request for improvement from the oil company (unlikely to be anything significant) then the contract will likely stay with the incumbent until normal tender time.