Imu will take the L, all the signs points to this.
Tension ended the moment Imu couldn't neg Loki and failed to put Zoro and Sanji out of commission.
Now we see Stall Piece for Luffy yet again.
Then another flashback that might give insight about how to send Imu back to Mary Geoise, with Gunko being unfrozen by the Nidhogg's pet and switching sides. May it be the magic circle or something to do with Imu's usage of his vessels.
Nika isn't going to perform worst than Nidhogg, he is the MC after all. Though we might see Fake Tension Piece with Imu overpowering Luffy while monologue-ing like he is doing now.
This could end with:
1. Imu getting sent back to Mary Geoise with the help of Gunko
2. Luffy having a powerup and sends Imu back like Joyboy;s haki did with the Gorosei
3. Imu simply running out of time
There's really no point bringing the Wings back only for them to lose or doing Stall Piece only for Luffy to fail.
If Oda wanted Imu to win and create all real tension for the readers, he would've done it like Sabaody.