People are repeating history. Gaban is with young Shanks who face mihawk and blackbeard before so he.has idea of his hakj but.it was not.yonko Shanks. We don't know.of Shanks unleashed angry haki on loki which loki got gang up by his crew to finished quickly or didn't show coc blast.
We did on killer strongest pirate statement at wano lead many people believe kaido > Shanks but it was misdirection by oda. Same thing happened on this chapter.
When Shanks and his crew appear outnowhere and pull coc Blast on imu cause him to tweak. That is oda of saying lol you thought imu haki is stronger than Shanks.