This isn't really a big enough section to be its own "confusing title" discussion, but this has nothing to do with "Good Christian Friends, Rejoice."
Weird composer name: Melchior Vulpius strikes again! And Cyril Alington looks like he's missing an R, but no, that's correct.
Big tenor/bass gaps: check.
Tenors and altos crossing paths: not quite, but they bump into each other on a G in the second-to-last chord.
Trailing alleluias: check, this is the "and alleluias" variety.
Bass/harmony echoes: check, the trailing alleluias are spread across several notes in the various parts so it's more of an echo-y thing.
Weird composer name: Melchior Vulpius strikes again! And Cyril Alington looks like he's missing an R, but no, that's correct.
Big tenor/bass gaps: check.
Tenors and altos crossing paths: not quite, but they bump into each other on a G in the second-to-last chord.
Trailing alleluias: check, this is the "and alleluias" variety.
Bass/harmony echoes: check, the trailing alleluias are spread across several notes in the various parts so it's more of an echo-y thing.