Considering Shin worded his statement as "somehow" absorbed in regard to South Kaioshin, that would hint at South being stronger than Pure Boo, possibly by a significant amount. As for the whole topic of the Z-Sword, Kibito only stated that numerous Kaioshin had tried to remove it, not all. Even if assuming South did, that may not be solid proof that SSJ Gohan > South Kaioshin with the new info provided to canon, as you could assume that Beerus would've made it so that Shin-jin couldn't unseal Elder Kaioshits.
That, and Boo absorbing someone a dozen or so times weaker than him just because he's got big pythons doesn't make much sense. Whilst he indeed absorbed the far weaker Dai Kaioshin for some reason, I think assuming Dai had hax techniques or an interesting fighting style akin to Fat Boo's a plausible reason that meanwhile, can't be attributed to South Kaioshin when Shin's talk of his strength suggest his abilities centred on just brute force.
Following on from that, I'd say Dai Kaioshin should be equal to Good Boo, seeing as how Good Boo's existence is comprised of purely this Kaioshin.
As for the other two, they can be anywhere. They should be far below Dai Kaioshin in both power and abilities given that Boo saw no interest in them. I'd say they ought to be closer to Shin than to Dai Kaioshin, given the hype that Kibito and Shin passed around in regard to the Saiyans and Shin believing there was at least some correlation between the Z-Sword and power would suggest these average Kaioshin to be below MSSJ tier.
