It’s easier to get a conviction for public order so I think that’s what they did.
Is it really? When there is so much clear evidence of assault? Why do you think that? CPS guidance says in most cases both should be prosecuted if the crime meets the threshold.
Having explained away the decision to prosecute for a public order offence you next explain away the judge's disgusting victim blaming comments because it was a public order offence so it doesn't need a victim.
If the offence doesn't need a victim then the judge has no need to refer to an 'alleged victim' or a 'so-called victim'. The judge said, I accept that had it not been for the alleged victim in this case there probably wouldn't have been an incident. so clearly the fact that there was a victim is central to this crime. So how can it not be an assault?
How can you watch that video and not recognise that an assault is taking place? How can you say there is 'no key witness to give evidence about how they attacked him' when a witness made that video showing exactly how they attacked him and that video was used as evidence?
We can argue about whether this met the threshold for ABH and we can argue about various aggravating and mitigating factors but it's ridiculous to suggest they would have been found not guilty of assault.