Yesterday at approx 0 degree asc timed16.35, 23.34 and 0 cancer at Hammersmith, England.

The different or unexpected did not happen such as an outsider winning or the non favourite winning

But why not the outsider or non favourite did not win when 0 asc usually indicates a change?

Aries Point in Uranian astrology means world or public life, the generality, the street, the many people we superficially know and have dealings with without making the acquaintance. Telluric (terrestrial) influences.
The ASC is the environment
Combined together AS/AP = meetings, places, locations, acquaintances

But why not the outsider or non favourite did not win when 0 asc usually indicates a change?

For the unexpected to happen you need an influence of the outer planets especially Uranus (aspect or midpoint).
A change can also be indicated by the Moon for example the AS/MO = change at your location, where you are. Witte said 'quality of the hour at this place'.
If you had an outsider winning every time the ASC was going over the Aries point, that would be great for all of us because we would say that life is predictable but we all know that it is constantly changing.
Astrology starts to work when you add or blend multiple factors. It does not work with a single factor.
If I read Venus in Scorpio, it is easy to focus on what it means. If I read Venus in Scorpio in the bound of Mars, in the 5th House sextile Neptune in the 3rd with a waxing Moon conjunct the ASC in Cancer, we are lost because there are too many influences to consider. But the answer is there. You are reading a unique moment that may never show up again and which contained your outsider.
Learning the basics, getting rid of what you are told and 'observing' around you what is happening will be your best teacher. As an example, take the ASC, check the midpoints it travels to at your location and note what is happening in your surrounding. That is how you start to learn. Do this with other factors and start to blend them once you grasp the elements of the elephant.

Best to you,
Ouranos