I don't think Juventus will replace Bonucci with Benatia.
He was good at Roma, but he was injured for 5 months of the season. Three separate muscle injuries. Was injured a lot in his first season at Bayern too - it's the main reason he hasn't done well there.
They can't rely on him to replace Bonucci - and they were linked with him long before our Bonucci bid came up as well.
Not to mention the simple numbers of it all. They can't go into a season with 4 CBs and 3 of them on the pitch at any one time.