I think he should, he knowingly gave confidential information to someone outside of government, potentially causing harm to this countries interests. I don't think Misconduct in Public Office reflects the seriousness of what he did, it's a very vague offence, not quite law, but still people get prosecuted for it.
I think Sarah Fergusson's role in all this, espcially with regard to Andrew Montbatten Windsor, her ex husband and his activities with Epstein, I wonder how much she knows and waht esle will be revealed?