When coasting (freewheel is clicking), the chain does not affect the suspension. Words from an actual bicycle engineer but RM armchair engineers know all.just gonna help you out here with a sincere response-- the wheel going up and down in travel is stretching the chain out, since there is a non-concentric pivot between crank and wheel. There is room for the chain to grow in the derailleur pulleys, but the crank or wheel has to rotate to accommodate that, which takes energy. Net result is that the bike does move through travel differently without a chain. Try it.