This will be like Whitebeard at Marineford. Imu will gauntlet his way through Elbaf and get heart attacks as he does so he starts to take damage.
I genuinely believe that Imu will manhandle the whole squad
Like Madara vs the Shinobi Alliance
I said a few weeks ago that Imu will also upgrade Sommers and Killingham, so they will be probably Zoro and Sanji's opponents
Each strawhat + giant will get a moment with Imu but they’ll take a huge L and Luffy and Loki will probably hold him off for a few moments until something unexpected happens
I have 3 possibilities
1. Imu's health gets worse
2. the Man with the Burnscar appears
3. Dragon or another huge character like Shanks will join the fight