The process of selecting the winner of the conference involves a large amount of engagement between the prospective companies and the participating investors. There is paperwork to gather for the due diligence process, interviews , pitches and Q+A sessions to help everyone come to a deeper understanding of the opportunity.
You can see the final pitch at the conference for the Latchel here: https://www.microsoft.com/en-us/research/video/seattle-angel-conference-xii-pitch-4-6/
A deep thank you to Microsoft Research for sponsoring the Seattle Angel Conference XII process. It made for a great program.