Obviously none apart from beating chained up 2.8B Loki within an inch of his life. Its merely portrayal at this point. And I don't give a crap about him being 1 or 2 ranks below Saturn, Garling was 1 below and is obviously >>> Saturn. Shamrock had to bide his time, couldn't leap frog his dad.
Shamrock just dropped the cerberus blade on him.
Not to say it aint significant, cause I'm sure that blade was the most damaging, but Shamrock mostly just was chilling while Gunko put beats by Dre on Loki.