Tell you what, I'm struggling to think of a more dominant keeper and centre back combo in my lifetime than these two. I'm not old enough to remember Banks & Moore, Maeir and Beckenbaur or, closer to home, Clemence and Jocky, but from the mid 80s onwards I think these two are as good as it gets. Schmeichel & Stam? Schmeichel was in the twilight of his career then so probably not. Buffon & Cannavaro? Cech & Terry? Desperately trying not to be biased but I honestly reckon our two are better (with the obvious caveat that they carry on playing like they do which, barring injury, seems likely). Were Rossi, or any of Baresi's other keepers, as dominant as Alisson? I dunno.
We're bloody lucky to be able to enjoy these two together at their peak.