Not to be negative and rain on your parade, but a measurement of the "highest speed of rudiments" doesn't indicate skill at a drum set, only the skill at rudiments.
Thousands people join marching bands and obtain great skill at doing rudiments at high speed, but many of them can not play a simple beat on a drum set because it's just not what they do.
Measurement of skill level is a rather esoteric question, because there is no real answer. It would entirely depend on one's objective. What would might a good measurement for a heavy metal drummer would be not as useful to a jazz drummer, and what might be a measurement for a jazz drummer might not the best indicator for someone who wants to know a little bit about every style.
A better indicator is how well can you play with other musicians in the style(s) of music you aspire to play?
If you join a band, or get hired for a gig or session, no one is going to care how fast you can or can't play some rudiments per se. They are going to care if you can play well enough for the task at hand.
Not to say rudiments aren't important, as they are the building blocks of so many things that going into playing with a band. And heck, you never know when you might actually be asked to play some rudiment rolls with in the context of a song.