It's hard to deny that, results-wise, Allegri is getting the most out of this bunch. However, this (let's call it) success has a lot to do with the low quality of the league.
I am comparing our team with the one that finished 7th in 2009/10. While there is no denying that Allegri is a better manager than Ferrara and Zaccheroni, I think that the 09/10 team, despite some aging stars, would have easily been in top 3 in this current serie A.
2009/10
Buffon; Grygera, Cannavaro, Chiellini, Grosso; Poulsen, Felipe Melo, Marchisio; Diego; Del Piero, Amauri
Subs: Legrottaglie, Sissoko, Camoranesi, De Ceglie, Trezeguet
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2023/24
Szczesny; Danilo, Bremer, Gatti; Cambiaso, McKennie, Locatelli, Rabiot, Kostic; Chiesa, Vlahovic
Subs: Rugani, Kean, Miretti, Weah, Milik