Why don gargoyles (generally) kiss?
Kissing is a human custom. The gargoyle equivalent is the stroking of hair and/or brow ridges. In the case of Broadway and Angela in “The Journey,” remember that Broadway has been exposed to a lot of modern pop culture, and Angela was raised by humans. In the case of Desdemona and Othello in “Legion,” consider Coldstone’s muddled state of mind. (Alternately, consider it as a mistake.