If kake01 is charged with Violent Disorder, sumo, then it is neither ABH nor GBH, but Violent Disorder. This is contrary to the Public Order Act 1986 (Section 2) and is nothing to do with Offences Against the Person Act (1861) to which ABH and GBH relate.
Public Order Offences concentrate more on the overall behaviour of those accused rather than injuries to persons that their behaviour causes.
As I said, other than in very exceptional circumstances, magistrates are advised to commit the matter to the Crown Court for either trial or sentence. This indicates that their sentencing powers (6months custody) are usually deemed insufficient. A fine is most certainly not an appropriate disposal for this offence in any circumstances.