SharePoint and Exchange Online eDiscovery Transitioning to Office 365 Security & Compliance Center

One way to do that would be for the eDiscover Manager to create 2 separate Cases: one for the email and another for the SP Content, they could assign different people to each case, see https://support.office.com/en-us/article/Manage-eDiscovery-cases-in-the-Office-365-Security-Compliance-Center-edea80d6-20a7-40fb-b8c4-5e8c8395f6da?ui=en-US&rs=en-US&ad=US#step3 for the details.

If you have a lot of eDiscover cases, i would expect this to get complicated and create a lot of extra work. I would use this as opporunity to begin breaking down some of the silo barriers between the teams. Maybe you could create an eDiscovery team with members from the various workloads, after they got familiar with their new responsibilities, they could get introduced to DLP, IRM and other services that apply to multiple workloads.

Organizations need to treat O365 as an integrated system of services that should be managed holistically. e.g., the SP people need to learn about idenity, licenses and mail, and the Exchange people need to learn about Delve, Planner, etc.