Isn't the point that the OP and responders seem to think that the Secondary is the source of the EOSID , which i incorrect . Secondly that as you say the ND will always display the yellow EOSID for you to fly if ENG FAIL is detected ?
You are correct on your expansion of my point , i prefer your explanation of the common waypoints and the divergent point . Ta !
I'm still amazed by the folks out there with thousands of hours on type who don't know about this feature .