Is the following question grammatically correct? And if so, does it sound right/normal?
Do you know who would have been a great couple?
I'm wondering mostly about the usage of who and if it's correct to also use it in a plural context. According to the following question, seems like indeed it is correct:
But my question is mostly to native speakers, even if that's grammatically correct, does is sound natural? Would a native speaker phrase it that way? In some of the replies to the question in the link I posted above, some people even suggested rephrasing. Suggesting things like all of whom instead of simply whom. Could something similar be done to the question I'm quoting above? Or is it perfectly fine?