The ambiguous use of the term lord actually seems to be from the Old Testament. An angel who appears as god , phrases like the word of the lord appeared and the lord said or the lord appeared by his word. Or the times lord speaks to god ......so on and son on. Man I wish I wasn’t typing on a phone or I could post some links.
The really interesting part is the textual variations of the 5000 or so known copies of the New Testament where Jesus and lord become interchangable. Some copies say Jesus and some say lord.
Were they thinking of two different beings ? I don’t believe so.