Coco:
I feel you've played a very consistent game all around. However, I don't feel you positioned yourself incredibly well to get to the end. A lot of ponies were catching on to you and as the game went on it became increasingly obvious you were a big threat. While I give kudos to you for finding two idols and winning the crucial F5 challenge, I feel you wouldn't have made it this far without them. If you hadn't had the advantages you had, how confident were you that you would still land a spot in F3, and what lengths did you go to to manage your threat level to ensure this would happen?
Firstly, thank you!
There were two events in this game that were catalysts for me coming out of the shadows and taking on the role of a threat: the Wonderbolt swap and finding the idols. To survive on Wonderbolt, I needed to play a stronger social game than I had been playing up to that point. But I'll focus more on the idols, since they're the topic of this question and the bigger reason my game transitioned into what it was during merge.
I found the idols during the very first round of merge. Think back to then: the game was very different in terms of who was perceived as a threat. I hadn't been too active on Crystal Empire, and in the obvious pair that was me and Granny, I'd argue she was the dominant one in the first half of the game. There were players like FlimFlam and Rainbow who were clear threats, and plenty of players (you and DJ, for example) who still had plenty of time to become threats down the line. I might be wrong, but back in that first round I don't think I had much heat on me.
The idols gave me the resources I needed to play a flashier game and still feel confident I would come out in one piece. Without them, my game would have looked much different all throughout merge. I would have taken my time in establishing an alliance with you - I definitely wouldn't have ambitiously offered that alliance to you/DJ/Granny that early on. And I probably would have given much more control to my partners in Granny and DJ, letting them establish themselves as the threats in my place. That was basically my plan from the start of the game with Granny, avoiding surpassing her in threat level so that if a shot was taken at one of us, it wouldn't be me.
So to answer your question in regards to the idols: the game would look completely different without them and I wouldn't have positioned myself as a big threat. I feel confident I could have managed my threat level well from that early on in merge.
I don't think I needed immunity at Final 5. Rarity didn't want you at FTC, and I believe at least Pear would have joined us. nopony felt comfortable taking you on in Onitama, and while I may have been a threat, surviving Final 5 would have made you a threat to Rarity and Pear as well.