If it wasn't already obvious enough, Bummers and Belilngham flanking Imu as his strongest subordinates with the sheer fire power of the alliance never made any sense irregardless of how filthy strong Imu is. Plus the strength ratio btw Imu and those bums was way too much for them to be adequate opponents for the wings so always felt off.
To add to that Nidhogg has been revealed to be a legend that even Imu acknowledges and he's alongside Joyboy and the wings as such Imu needs a stronger army, so we just might get Wings v Gorosei this arc.
Either that or Imu upgrades Bummers and Bellingham's contracts to make them much more formidabble oppponents.