There's Not Much Apostolic Disunity In The Gospels

Critics of Christianity often allege that there was widespread disunity among the early Christians: Paul disagreeing with the Twelve, a Petrine community opposing a Johannine community, and so on. There's a large amount of evidence against such claims. I've written about the evidence for apostolic unity in 1 Corinthians 15:11, in the earliest patristic documents, and elsewhere. I've been struck lately, though, by how much material there is against these claims about disunity in the gospels. In John 13:10-11, for example, why would the author have Jesus commenting on how all of his rivals (or rival communities, etc.) are "clean"? Or think of the sitting on twelve thrones in passages like Matthew 19:28. That isn't just an expression of unity, but even unity in an eschatological context, which rules out a future falling away. (Judas is explicitly and repeatedly referred to as not being included in such comments in one way or another, whereas nothing comparable is said of any other apostle. The authors were capable of communicating that they had exceptions in mind if they wanted to, as their comments on Judas demonstrate.)