In Philadelphia's city finals, no competitors completed the finals course, a first in American Ninja Warrior history. In Stage 1 of the National Finals, many veterans of the show such as Geoff Britten and Brent Steffensen were eliminated early, while Jessie Graff became the first woman to complete Stage 1, placing fifth. Tyler Yamauchi became the shortest person ever to complete the Jumping Spider obstacle at 5'1 ''. Only 17 competitors successfully completed Stage 1, the lowest in ANW history. On Stage 2, all athletes were eliminated except Drew Drechsel and Daniel Gil. During Stage 3, both Drechsel and Gil could not complete the course. Gil fell on the Ultimate Cliffhanger, while Drechsel went the farthest, but fell on the Hang Climb. Contrary to season 7's multiple winners, no season 8 competitor was even able to complete Stage 3.

Based on this passage, who won last year's american ninja warrior? Let's give stream of consciousness first:
To answer the question, consider the following: In Philadelphia's city finals, no competitors completed the finals course, a first in American Ninja Warrior history.
So, the final answer is no competitors completed the finals course.