Alves was never part of any defensive core. He played like 5 good games at right back, the rest were up the wing. Only Bonucci did that but we are ready for this, our CBs are all great.
We majorly strengthened the attack which is great. In midfield, signing Bentancur looks like a good move that may pay off soon. Szceszny is a great addition, best back up keeper in the world for sure, he was huge last season.
Its been a very good mercato. A bunch of talented players that aren't 30+ year old who would be past their prime soon. Bernardeschi, Costa, Szceszny, De Sciglio, Bentancur is great. That's quite a haul. If we hadn't lost Bonucci it would be amazing, 4 of those signings could very well be starters by next season, maybe 3 of them this season already. That's a lot of quality, a lot of youth and a lot of promise.
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Juve has been transitioning from the old core. The transition was made great by buying older players that could patch up things right away in the short term. Now we are building a new core. After next summer when some of the oldies retire I expect much less movement than we are seeing. Our younger players (of which we have many) will have been ready to be our new main guys.
Szceszny
Rugani, Caldara
De Sciglio, Alex Sandro, Spinazzola, Lirola
Pjanic, Bentancur, Mandragora, Sturaro (I can only hope...)
Dybala, Bernardeschi, Costa, Orsolini
I'm sure I'm missing some. Plus the older players that are great (Chiellini, Higuain, Marchisio, Khedira, etc.) They've been doing great work.