wow, finally caught up! So, a couple of questions: with respect to Dungey's tantrum about Banks not being there in person originally, then showing up today.. Obviously the crown hadn't initially planned on his being there. Did they bring him in based on Dungey's reaction? And can they bring anyone in anytime? Or did they always plan to? Does each side have to declare their subpoenaed people before trial begins?
In no particular order.....
1) The Crown must disclose all evidence it plans to present to the defense, long before the trial. This would include witnesses planned. The defense has no reciprocal obligation to disclose what they plan to present or what witnesses they plan to call.
Here's a summary of the rules of disclosure:
https://en.wikibooks.org/wiki/Canadian_Criminal_Procedure_and_Practice/Disclosure
(2) We can't say whether the Crown brought in Officer Banks because of Dungey's reaction or for some other reason. As for can they bring in anyone anytime? The answer is, yes, BUT. They can bring in an unplanned witness, but this would be one of the "legal arguments" presented to the judge in the absence of the jury. The judge would rule on whether the new witness can be called.
3) It would appear that the Crown intended to bring in Banks' evidence, but thought it sufficient to have that presented by another member of the investigation team. Obviously they revisited that thinking but it may or may not be related to Dungey's reaction.
4) Defense doesn't have to submit its witness list to the Crown by way of disclosure; it does however have to get the judge's ruling on these witnesses but I'm not sure at what point in time this occurs, though it would likely be before a trial begins.
5) Retired police officers. This wasn't part of your post but many have said what is it with all these retired police officers!!
There is no epidemic. I find the number of retired (since the events of the crime) officers involved to be par for the course. Consider these factors:
-- a high-profile case like this involves many senior specialized police experts with much experience, training and service. Few rookies would be involved at important levels. Thus, a non-representative sample of the various forces is engaged on this case, and many of these officers have 20 years or more in their fields. Thus, many are closer to retirement age for that reason.
-- OPP, for one, and other local forces are similar, in that an officer can retire with full pension after 25 years of service. Their salaries are quite good (and they deserve them) but IIRC an OPP neighbour told me his pension would be 70% of his pay pre-retirement (the formula was a little more complicated, but that was the gist). So, many retire at younger than usual ages - as young as 50 - and go into other lines of work if they wish, as many do. Or they can "retire retire" - take up golf or fishing or whatever turns their crank.