User blog comment:DeathGodPrayer/Talk About What You Want!/@comment-82.178.91.153-20140209043700/@comment-9339850-20140209045240

I think the whole Sirzechs/Grayfia conversation replacing Lord Gremory/Phenex was to just use voice actors they already had contracted and not get new ones for only 20-30 seconds of content. Same how Irina was kept at the end of Season 2 to keep using her voice actress