Why DX O2 show a different role than SAML?
From SAML shows "Operator CC":
From DX O2 shows "User":
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The listing shows their roles. Users is a generic name for a role. In your screenshot, the type of 'Federated' is shown, so is a SAML tenant. Because multiple roles can be associated with a userid based upon their LDAP/SAML group membership, the Users is listed for roles. If the user is having groups matching an OOTB role of TenantAdmin, then that is a specific role and can be shown in the listing. They either do not having Power User configured, or don't have any users in the listing you've shown, but if they had a user matching Power User then that OOTB role name would be shown for those users as well.