I think he wants to know what would happen if you hit toga with the mcp alt window set to DA and not MAA. Therefore a lower alt than you are already at.
Yes, that was my question
You do not set DA in the MCP window for a start! Why would you?
Maybe not DA, but it might be necessary to set an altitude below platform ALT during a CDA if you are intercepting the G/S from above (not advisable I know).