Samuru doesn't use link authority, it analyzes pages and matches what you queried to the types of pages and picks the best matches.
Let me give you an example.
You search for "How to Make cupcakes" Google says give me the pages that have the most inbound linkes (over simplification) that contain all those words. The winner is Brandon's Cupcakes (not really but play along for a minute) because it says, "We know how to make the best cupcakes, because we have been doing it for 25 years"
That is not a useful result. Samuru on the other hand says "how to make cupcakes is a search for instructions" and it looks for pages that match the words, and are written as instructions.
We weigh other factors, like is there an author associated with the article. Do they routinely write about the topic?
We do this for reviews, products and other things as well.
To be a full replacement for Google we need Driving directions, and image search and a lot of things. But in order to do all the other things we are doing we needed a search engine. (related content, analysis, speed testing, building a corpus of words)
Responses get better if you search something someone else has searched or do a second search 30 seconds later. This is because we haven't deep indexed the entire Internet yet, and so we don't have all the deep data.