"I'm not a member of the 25 Golden Crest Families, why am I invited?", Rex said in confusion.
The content of the invitation clearly stated the place and time of the banquet and also that it's exclusively for the 25 Golden Crest, and Rex is not a part of the 25 Golden Crest.
So he doesn't get why Stevanus asks him to go.
He did make a deal with the Reed Family and become their friends, but it's still not enough reason for him to be invited to the banquet.
Ari then replied, "I don't know the details, I'm just a messenger"
Hearing this, Rex waves his hand as Ari left the place the same way he appeared.
Rex is still frowning while looking at the invitation, 'Is Stevanus going to challenge the Atkins Family? If that's so then it makes sense for me to be there I guess'
After deliberating for a while, Rex puts the invitation in his pocket.