I think it depends on the nature of the idea. Some are so original that just the idea independent of the execution are worthy of note (famous conjectures in mat

I think it depends on the nature of the idea. Some are so original that just the idea independent of the execution are worthy of note (famous conjectures in mathematics come to mind). Some seem so obvious that it seems likely that many people dreamt of them at the same time. Hard to tell in this case.