It's quite possible they are simply setting up a captive third party administrator company. All of the companies will fund health insurance which will then have

It's quite possible they are simply setting up a captive third party administrator company. All of the companies will fund health insurance which will then have benefits designed for employees and care overseen by this third entity which would be a not for profit. This entity would then have to go out and negotiate contracts with providers, drug companies, lab testing facilities etc. Given the size of these entities, they would have significant negotiating power with providers and hospital systems which could keep costs down for members.