did marrone, asamoah and isla flopped before at their respective italian clubs? no they didn't, look, marchisio as good as he is, never really that fundamental to our team, even in last season when he was at the peak of his career so far, he was not as fundamental as pirlo and vidal were; the stats speaks for themselves; yes he scored important goals, but IMO that was highly influenced by our forwards inefficiency.
I think by now marchisio is replaceable by marrone, asamoah and isla, and if teams come and offer us swap for him with WC forwards we should not hesitate to do it!