hmmm nice eyes u have. i didnt noticed this.
But, now that u mentioned, i could think of this:
Actually the Cathedral, if my memory still work well, was built by the Horadrim and not by tha Zakarum. The horradrim buit it atop the soulstone of Diablo, to hide it from common ppl.
So, the horradrim always have had kindness, knowledge and participation on the archangels plans, mainly because of tyrael. So i think it would be normal if they depict those kind of images on the cathedral, with angels etc..
Excerpt from Diablowiki:
"The Tristram Cathedral is an ancient Horadrim edifice and a very familiar location in the Diablo universe. Under it, they imprisoned Diablo in his soulstone. When the Horadrim faded away, the Cathedral was left as a decrepit ruin. When the Zakarum came to be the most practiced religion, the Cathedral became a place of worship and the seat of King Leoric, who converted Khanduras to the Zakarum religion. "
And this one complements it:
"The Horadrim is a group of ancient magi dedicated to combating the three Prime Evils. This now almost extinct band of arcane heroes was originally founded by the Archangel Tyrael. Among the recognized members of this group is Tal Rasha, Jered Cain and Deckard Cain. Currently, Deckard Cain is the only remaining member of this cult, and is schooled in the most profane lore and knowledge pertaining this group. "
Edited by Brunobyof on 12/13/2011 5:00 AM PST