Hell, put any two people on a “knowledge” task and even if both were capable, there’s going to be a person that pretty much does the work and another that largely just sits there. Unless the task has a clear delineation, but management almost never assigns a two person team a task that’s actually delineated enough for the two person team to competently work.

If the people earnestly try, they’ll just be slower as they step on each other, stall on coordination, and so on.