RKT powerset is so ambiguous. Even the personified Odin force was unclear...I mean it seem to imply that Odin was damn near aspect level in power. Then how powerful were/are TWSAIS?. That greatest thing RKT did (imo) was to unmake Mangog with no effort.
PKT was kinda underwhelming to me...
CKT should definitely win this...He EASILY destroyed a super amped Galactus and then took out a multiversal destroyer with one shot.