An open fifth, cadence, and the initial "Ky" of the mass text are elements loaded with associations. We would only need a split second of a Kyrie fifth for it to stick in memory over vague microtonal and timbral elements. Many composers have used the mass text through history. Brian Ferneyhough noted it's independence towards any personal language.
«It should perhaps be explained that the choice of text had less to do with statements of faith than a feeling that the Mass ceremonial itself is a culturally integral monument, both historically and formally. As such, it has managed to withstand unscathed the efforts of composers of many periods to bend it to their individual musical ends. This may be taken as something of a back-handed compliment I suppose, but the task was undertaken in a spirit of profound respect on my part. It was a rather effective method, apart from any other considerations, of attacking the problem of identity which less culturally resilient sources might have left largely open.» 1
This is a typical Ars Nova cadence.