Great first post Wolf! I'm doing research on Cardano and am quite intrigued for a number of reasons. They share on their Why Cardano page that they don't have an "authoritative" white paper nor comprehensive roadmap, but instead are approaching the project through iterative research, protocol design and publication done in parallel with active market operations.
Does breaking the whitepaper rule make Cardano an unpredictable risk or given their strong and thorough argument for the approach (in essence - openness to change enables scalability, extensibility, and resilience to future threats), one of the most promising emerging blockchain platforms?
The other rules they definitely pass - decent website (with perhaps some navigability issues), public team and value proposition (Ethereum++).