Diminished chords (Bill Dobbins)

I'm currently reading Bill Dobbins book "a creative approach to jazz Harmony" and I'm rather confused when he mentions diminished chords. He states that diminished chords can resolve to any one of the 4 chord members. He then gives the example that a Bº7 chord can resolve to C,E flat, G flat, or A. But aren't those the chord members of a Cº7 chord. I don't get it.