I don't think it is helpful to either party to speculate about this on a public forum. It seems to me this is an HR matter between the EFDSS and Nick Hallam. The decision was presumably reached after a formal appraisal and communicated to him, and the details should be kept confidential. Possibly the EFDSS will make a formal statement in due course, but even then we shouldn't expect them to reveal any more detail than we have already, and why should we?

At the moment the understandable reaction is to support the underdog, but we don't know the facts, and speculation could be damaging to both parties, especially if rumours and half-truths start to leak out.