What do you mean by indirect support.
You talk about safety planning, safety planning often involves not escalating, not calling the police because children with ND are escalated by authority or conversely are thrilled and motivated by professional involvement (ambulance/police etc) and so you mange that by not calling authorities (talking generally here not necessarily for this case). The police will say its a MH issue, MH teams will say its behavioural so they cant act. Right Care Right Person means this isnt a police issue but neither is it an issue for other services because those other services will see it as a criminal justice issue (which is my view)
The services appear to have shared the information as far as I can see.
Risk assessment - the problem here was that risk assessments were done and CAMHS concluded low risk, they are the guide to inform everyone else, professional judgement
People also are challenged by me when they use terms like 'risk management' because it seems to imply that the risk can be managed at lowered. It cant always, sometimes yes, sometimes no. Positive risk management is where you work to say that you accept there will be risk because either there are no alternatives (as I said this boy wasnt going to be locked up, sectioned, restrained, put in secure, he didnt meet threshold for those things) or because in other cases the alternatives are viewed as harmful to the child/not effective.