I broadly agree with this.
On point 1, the email Sandie never received is interesting. I doubt we will ever know why she didn't receive it. Unless there is evidence to show that it was never actually sent or that it is a recent invention, I would be surprised if the tribunal made any finding on that point. However, it does raise the question as to why RCN never followed it up. Surely they would normally ensure the member had received and responded to it.
Then there is the refusal to support Sandie's legal action. As you say, was that refusal reasonable and consistent with their policies. Also, are the policies applied rigidly or do they exercise some discretion when applying them. If they use their discretion, was they way they exercised it in this case reasonable and, importantly, not for discriminatory reasons.
Point 2 is the real nub of the case. Were any of RCN's decisions because the case was about her GC beliefs? If Sandie can establish a prima facie case that RCN discriminated against her due to her beliefs, it will then be up to RCN to show that their decisions were taken for legitimate reasons.
Re point 3, yes, Sandie does have to show that she has suffered detriment, but that is not an issue. If RCN should have supported her legal action, their failure to do so provides all the detriment required. It left Sandie having to find her own legal advice and fund it herself - the fact that a benefactor has actually provided the funding is irrelevant.
Moving on to points 4 and 5, suspension is supposed to be a neutral action. On its own it does not mean that management has chosen a side. However, it is clear from the evidence in Sandie's case against NHS Fife and Upton that many of those in senior roles in her employer made up their minds without bothering with little things like evidence and giving her a fair hearing. RCN should have been all over that. The question is whether Sandie was treated differently because the case was about her GC beliefs.
Looking at the case so far, I think NC is doing a good job of showing that RCN is captured and is not a welcoming place for those with GC beliefs. I note that some of the witnesses she called are also taking action against RCN. This tribunal won't want to prejudge the outcome of those cases, so it will be interesting to see how they approach this. However, if the tribunal accepts that RCN is captured, that is a prima facie case that they may have discriminated against Sandie. The question then is whether they can show that they have not.