At that time it is obvious that Dragon was stronger than Kid Shanks. What is WG?He can't be Admiral lvl, Dragon is above Yonko lvl I assure you! Shanks won't be beating him.
It is a portrayal how everyone was crying and watching after Roger's death publicly as youngsters while Dragon made the whole area rain from the shadows. Shanks back then looked like a kid crying for his father while Dragon was like the father whose expression said that in time justice will come.
He'll be above Yonko's cause numbers alone arent getting the WG, Admirals, CP0 and the whole navy plus eventually the Shichibukai down. If Sabo's around 650m (even though thats most probably because they dont take credit for their deeds) the rest will also be around Sabo's lvl. And Dragon has to be atleast personally above Yonko level to be secure enough to attack the WG.
But as Trump says, Dragon is already gonna show his power while Shanks is not. I could see him being near to Shanks, I mean, BM has a lot of weakness and she does look strong.
Kaido is gonna lose to Luffy and Law. Shanks stopped Kaido and return the marineford with no scratch, Shanks could also have a great observation Haki. Shanks might be stronger than Kaido and Whitebeard.
Look at the commanders of Shanks, they do look like the top of top. The smartest guy of OP, the greatest shooter, and Shanks himself could be stated to be equal to the best sword man.
Well who know, time would make it clear.