I don't see any problem, I think over-moisturising is only if you're excessively conditioning very frequently (like every day or every other day) or hygral fatigue if your hair is constantly wet or takes literally days to dry. I can't see there'd be too much difference between leave-in and rinse-out other than if you're leaving it on your scalp as well (perhaps with certain ingredients not supposed to be left on the skin).
Honestly, if it works, why not?!
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