Thanks for explaining the differences between the two conditions.
Only one concern:
If there is trigger point in Myofacial Pain Syndrome then will it not have tenderness too????
I would think there would be severe pain at the trigger point.
You have mentioned tenderness present in fibromayalgia which is diffuse in origin......???
I think you will get tenderness in conditions where pain can be localized means MPS as you mentioned pain is local....
Might be wrong, but this is what I think. Open for further discussion.