The caretaker's mate should have been used for a big season finale much further down the line. Something huge and memorable that didn't undermine the pilot episode (which Cold Fire did).
Oh and there's also some stuff about Kes having magic brain powers or something. I wasn't really paying attention to any of that. You know, cos it was Kes and magic brain powers.
I agree though not in the way you would likely consider given your concluding remark. I think that one could at least reasonably posit that to end the series it might be fitting to return to the beginning and make the Ocampa, specifically Kes, the ultimate agent of Voyager's salvation. To do this, Suspiria returns to the ship to satisfy her curiosity about the fate of these aliens who once showed her compassion when she was at their mercy.
As the plot develops, Voyager becomes increasingly ensnared in what becomes an intractable, seemly deadly threat from the Borg, one which all their knowledge, experience, and Seven's efforts seemingly can't avert. Despite her more favorable opinion of the humans, Suspiria finds she can't bring herself to wield her considerable powers to help save them. But she is aware of another being with abilities equal to her own, that has deeply rooted and cherished ties with the crew. So, what follows is Suspiria's search for this creature (probably not hanging out in Exosia) while Voyager's situation becomes increasingly dire.
I won't speculate further on exactly how we reach the denouement except to say it would contain wrenching moral/ethical decisions, the requisite savage combat with the Borg, and possibly the death of a certain regular crew member. This exit for the series would then contain the Borg, which would have to be accepted as de rigueur by the show runners, but without the time manipulation that was cavalierly brought into play (especially since Janeway was its agent). I think that completing the circle in this manner would have given the finale the opportunity for a greater poignancy and bittersweet quality than the unqualified triumph that was the ultimate choice. Perhaps there might even have been a greater opportunity to have some time shown back on Earth, an issue that often comes up in criticism of the bow out, if only in a perfunctory celebratory mode.
Well, I guess I've gone rather far afield from the part of your post that drew my attention, but there you are.