Not this time. 'Cause probably the defeat of Sommers/Killingham will damage Imu enough to let Luffy and Loki "beat" Imu.
So I guess it will be simultaneously.
See, I have a number of problems with that tbh. Namely the fact that......if Imu looks like he is losing, why exactly wouldn't all of the Gorosei just come? Not a single person has mentioned anything about the Abyss circle in the castle, so that's free game, and nobody seems to have even CONSIDERED getting rid of it (granted, why would they? Its not like they know anything about how these powers work). Plus, if Saturn or Gunko could just create new circles and summon the Gorosei/Holy Knights whenever they felt like it, I'm sure Imu could. Meaning anyone fighting Imu could just find themselves fighting him AND his closest subordinates.
There realistically feels like there is no way the WG should lose here, without the villains just......forgetting they can easily call for help. At....any time. Instantaneously. Hell, if Imu has a couple minutes to himself at any point (like if Luffy runs out of G5, and Loki still isn't back yet......and Imu for some reason doesn't just kill them. Lol) he could just Domi Reversi every relevant vaguely powerful character who isn't Luffy/Loki and completely flip the situation AGAIN.
Seriously, even IF Imu might conceivably lose in his slap fight with Luffy (which would be weird, for all sorts of reasons) there is no logical way he still shouldn't get what he wants. There's no set up for a Joyboy Ex Machina to stop him here, unlike with Emeth on Egghead.
.....simultaneously, I have a hard time seeing Oda make Luffy outright fail. So.....confusion still abounds. Lol. All i can hope for is that it makes sense somehow.