No. All this does is fragment the information we store. Closing as duplicate helps consolidate information, even if it's not presently existent.
If there are two places to place the answer, this means that one person is not necessarily going to receive the answer. Furthermore, someone who searches may find the wrong question and think it unanswered. And now we end up with answers split between two questions.
Chances to get the answer are already improved by keeping the duplicate alive but closed. This way, two different searches will be able to yield the same route to provide an answer. It's slightly indirect, but this way both askers only have to monitor a single question for all the answers they'll need.