Because narratively it makes sense. If Queen knows Judge/Germa because of their history with Vegapunk (considering the Numbers are from Punk Hazard), then its also likely Queen is familiar with Sanji's suit. If that's the case, we could see some immense growth from Sanji if the suit is either nullified or if Queen knows how to push Sanji to unlock his potential as a Germa son, like his brothers have.
Barring their eccentric personalities and love for women almost match, its the matchup to me that has made most sense in a while. And we know if Sanji takes on Queen, Zoro likely will take on King, and there's a decent reason to believe that King was the reason the Shimotsuki were massacred in Ringo. King might recognize Zoro for having a pretty similar look to Ushimaru.