If a top player never fought back in a given match, the opponent would win, no matter who they were.
The world is real (maybe) and there are forms of variance between the above extreme example and points where top players start playing out of this world. In between those two points is where they most commonly play at, usually towards the upper end of that scale but there are
plenty of times when top players play inconsistently and come close to losing sets against players they shouldn't, or even get upset by said players.
This scale applies to everyone of course.
I'm not meaning to under-rate Bowser. This level of power shown by him is highly notable (beating several DIFFERENT top players is
always notable even given my paragraph above) and should be taken into consideration. What I don't like is "Now Bowser is top tier" and equally so "This means nothing for Bowser" - what this actually represents is *something* that we probably don't know how to define yet, and should be on the look-out to see how Bowser fares against these high-level players in the coming months.
In other words, don't assume the world runs mechanically and that a win always equals...
A win, if you catch my meaning. We're predominantly theorycrafters and should be looking at the why as well as building our theory off reality.