For what it's worth, I did mine rando, and got the following results:
Ally: Arabelle
Sword: Berez
Holy Symbol: Blue Water Inn
Strahd's Book of Emo Poetry: in his castle
Last Stand: MISTS (????)
I'm honing in on the idea of Strahd looking for an heir. It's implied a bit that Arabelle might not be a "normal" Vistani child, and the idea is that she's god von Zarovich blood in her, allowing her to bypass Strahd's "blood ties" guards and wards. He's seeking her out to make her his true heir, and isn't interested in harming her, but in
using her. The party has a chance to turn her against him instead. At which point maybe he won't be that interested in raising her to power.
The sword worked fine - they stumbled on the statue and dug it up.
The holy symbol worked super great: the Martikovs have become rather important NPC's in my game, since they gave the PC's the quest to the Wizard of Wines to prove their worth before they rewarded the symbol. A big arc of the campaign was about this.
I'm using the Last Stand card as a way to work a bit more Ezmerelda into the story - she's a Vistani, so she can draw again and "pierce the mists." Until she does, Strahd won't stand and fight the characters
anywhere.
They may not end up using the Ally, and they have been desperately trying to figure out what the other card is
before they go to the castle (hehehe), but they're following other leads at the moment.