Hard to be real competitive in just regular spar. I don't do gst since I simply never have time for it. If I could get more out of spar other than a little trophy furniture I would be sparring more often.
Then there are the ones from other nations/countries. Not keen on just going up against delayers and laggers all the time, having to adapt to that ruins the experience, I shouldn't have to.
As for #1 sparrers, I don't count Sarah as one of them for a reason I shouldn't have to explain. Anyone who could beat Sarah legit is very good in my books. Patience, timing, consistency, mind games, etc.