You are on a merry-go-round. There are other people also sitting on the horses and carriages there as it goes in circles. Suppose there is someone ahead of you about a quarter-way forward. Are they "leading" you? Or following, but further back behind you? Does the question even matter? Whether it is a voltage or current source, the cause and effect happen together in time. Don't read too much into words. They are for communication to others. Not a description of reality. Nature doesn't care at all about the words we choose to apply. Never did. Never will.
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