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Right? edit
Are there any sources that proves the topic?
To my knowledge, a fan-in is a factor of how many "standard loads" an input constitutes. Almost all inputs have a fan-in of 1, but it is imaginable that there is a more complicated inputs that needs more drive so that it loads an output like e.g. two (or more) standard inputs.
The design considerations on PDF-page 2 of this old SGS document commends my opinion, I think.