All drawings are absolutely intentional, and this is by far the most ominous we've seen Shanks. Everyone cheering around him and hes the only person eseentially not smiling with a serious look.
Im sorry, but even though Kid is the underdog here and will likely take out several allied RHP ships, he is severely underestimating the situation here.
Its essentially the same way the scene was left off with Blackbeard and Law. The pieces must be knocked off the board, and Law/Kid are not direct competitors for One Piece since they are essentially allies in this story.
They do not have fleets. Their crews do not have ~10/11 notable memebers, and neither are Yonko. I absolutely think they will be allies to Luffy in the EoS, but they are defintitely losing here.
This is how you have them concede. They lose to the two major competitors left for One Piece that need to still have their own arc focus and characterization. When Luffy becomes PK, thats where they will respect and ally with hin for the Final War.
I really think the pieces are all starting to come together in a way that makes sense