Next year will be interesting, with the announced goal of a smaller class because of this year's extras.
The Admissions Office sets a line for the WCS,above which a candidate may get an LOA. They don't announce where that line is. They also don't announce what the passing score is for the CFA, nor what "qualified" means. So, the CFA score that got you a pass this year might not work next year, and the bar for an LOA or for "qualified" might be set higher. I don't know that it will be; only Admissions could tell you that. But the standards are not set in stone, and you will be facing a competitive year.
That said, yes, you're right, if you're a principal nominee and "qualified", however they define it next year, you're in.