marchisio reads the game well, excels in 1-2s just like what everyone else is saying. the only thing different is marrone has a stronger build, hence he is gritty like vidal and can hold his own physically in a similar fashion.
he is also slower than marchisio has more vision than marchisio
marchisio is not a playmaker , marrone can be one , not pure fantasy like pirlo but can set the time of the team and add more physicality and help more than pirlo in defense
now i have seen him as much as you have , but those who have seen him in siena with conte , or in italy u21 say the same things i am saying
this is not a personal opinion after 3 games , it is an opinion of people who have seen him more than me
now i am not saying he can't play at marchisios or vidals place m even buffon can play there if you put him , but that is not his place
his place would be in front of defense