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Kiron, thanks, but I'll let someone else answer this time... :)
But, even though you reply may or may not be partially right, the real question is very simple (and I'll update the original discussion question, so some can address it)...
Why Scope Control does NOT have Risk Register as an updated document
If Control Schedule has Risk Register as an updated document
If Control Costs has Risk Register as an updated document
If Control Risks has Risk Register as an updated document
If Quality Control has Risk Register as an updated document
If Monitor and Control Project Work has Risk Register as an updated document
If Control Procurements has Risk Register as an updated document
If Control Resources has Risk Register as an updated document
If Monitor Stakeholder Engagement has Risk Register as an updated document
Why Scope Control does NOT have Risk Register as an updated document