But it's constantly portray fully kryptonians(superman,supergirl)strength > conner.
For instance,like you mentioned(And BTW,those scans isn't my post)SG issue,SG already breaking free from conner use raw strength
Attachment 80408
Attachment 80409
And about you said supergirl"I hit and broke your jaw before you hit and broke mine"
The original words is"Which(broke jaw) you would done the same thing to me if you had the chance".Those words never said conner have enough power to do that(which I actually think it's possiblt,because I think conner and supergirl's strength gap not big enough made supergirl could ignore conner's attacks),just said in some condition conner could do that(could mean take the first hit,or need some boost,or supergirl catched by surprise ETC)
And i didn't see why owning someone but later defeated by the same person(which just after one page)is impressive thing.Many characters did owning some far better opponents
For example,mordru been owned by PG in jsa issues,or alan owning mordru in the same princes of darkness story arc.But later alan just been pulled his starheart out by mordru
Or in OWAC story,probes have been showed multiple times owning zod squad,But in later action comics,Zod killed two probes just by himself
Or even maxima owned doomsday
ETC
And yes,ordinary kryptonians is far weaker than superman family(except like zod and his aides those have important role in story,like ursa could defeating supergirl).Even non this giant kryptonian has been one-shotted by supes.
It's basically like best krytonians(superman,zod,supergirl,or could consider doomsday since he similar krytonian genes suggesting he was a krytonian.....ETC) >best half kryptonians(conner) >ordinary kryptonians.IMO
SB though constantly said his power different from superman,but also said he have "most superman's power),and been portrayed less strength than superman.So if consider brutal combat,theoretically is kryptonian should have advantage