All of these players had 85% or more pass accuracy, had played for 75% or more of the season and averaged more passes per game than Maguire. This ignores the Portugese/Neatherlands leagues (only did the top 5) so Dias/De Ligt would feature on this list for example. Now obviously some of these are unattainable as they're at rival clubs and some are on the wrong side of 30 years old. If I reduced the % of Season down from 75 to 60 it opens up more players too.
It's worth pointing out that with the current criteria, not 1 United CB featured on the list.
Clearly it also depends what skillset you would want. Maguire is one of the best headers from Europe from memory so thats clearly some bonus marks for him. If we're looking at purely distribution however then see below:
Passes per Game | Name - Club, Age, Position
90.4 | Aymeric Laporte - Manchester City, 25, D(CL)
86.6 | Niklas Süle - Bayern Munich, 23, D(C)
79.9 | Virgil van Dijk - Liverpool, 27, D(C)
76.9 | Antonio Rüdiger - Chelsea, 26, D(CR)
75.5 | Jonathan Tah - Bayer Leverkusen, 23, D(C)
75.1 | Aissa Mandi - Real Betis, 27, D(CLR)
72.8 | David Luiz - Chelsea, 32, D(C),DMC
72.2 | Marcelo - Lyon, 32, D(C)
71.9 | Kalidou Koulibaly - Napoli, 27, D(C)
71.2 | Toby Alderweireld - Tottenham, 30, D(CR)
71.0 | Nico Elvedi - Borussia M.Gladbach, 22, D(CLR)
68.7 | Marc Bartra - Real Betis, 28, D(CR)
68.6 | Milan Skriniar - Inter, 24, D(C)
68.3 | Gerard Piqué - Barcelona, 32, D(C)
67.9 | Kevin Vogt - Hoffenheim, 27, D(CR),M(C)
66.8 | Christophe Herelle - Nice, 26, D(C)
66.6 | Dante - Nice, 35, D(C)
65.7 | Robin Knoche - Wolfsburg, 27, D(C)
65.3 | Matthias Ginter - Borussia M.Gladbach, 25, D(CR),DMC
64.1 | Niklas Moisander - Werder Bremen, 33, D(C)
63.5 | Jason Denayer - Lyon, 23, D(CR),DMC
63.4 | Joachim Andersen - Sampdoria, 23, D(C)
61.4 | José Fonte - Lille, 35, D(C)
60.3 | Gianmarco Ferrari - Sassuolo, 27, D(C)
60.1 | John Brooks - Wolfsburg, 26, D(C)
60.0 | Mateo Musacchio - AC Milan, 28, D(C)
56.4 | Harry MaguireLeicester, 26, D(C) - (I put him on here but his pass accuracy was actually slightly less than 90%)