Kharn is fodder and gets one shotted. Guilliman should stomp Abaddon too.
Bloodlusted Angron could not one shot pre Khorn's greatest champion Kharn, but Guillimen will one shot post Khorn's greatest champion? Not seeing it.
Honesty team wins easy. Abbaddon with every Chaos Gift and Chaos backing should be Primarch level. We know he is stronger than any Daemon Prince or Greater Daemon who match Primarchs at times. Not to mention armed with a reality rending Daemon sword.
Kharn is also better than most daemon Princes at this point. Making Chapter Masters and squads of Grey Knights look like fodder. Kharn has taken down easy GEOM Greater Daemon, Celestine lmao. The soul devouring Gorechild will do work.
Someone, who cant beat Azrael, a space marine for God's sake, cant contend with a primarch.
Someone, who has a hard time with Celestine, cant contend with a primarch.
And none of them are psykers. Bobby G can contend with Daemon Primarchs in CQC.