all good instructors are not bias.. to a degree. this isn't a 'bad' bias by any means. a great instructor is about 95 percent impartial, but theres always that little 5 percent in him, where he notices someone with that certain 'spark.' perhaps its that scrawny, hot-headed 16 year old kid who reminds him of himself 20 years ago, or the 250lb newb who shows up to every class, rain or shine and sweats thru the workouts- even when half the class has stopped. they are the shinya aoki to yuki nakai, vitor to carlson, marcelo to fabio, etc. sometimes the bias is quite evident when the teacher gives his prodigy a noticable increase in attention over the other students and shows him more moves/rolls with him lightly. sometimes the bias is disguised as tough love, in which case the teacher may make his pupil do 5 more pushups than the others, or 5 more situps, or roll harder for 10 more minutes to make the guy puke, just to see if he breaks. i once read a story on some forum where this guy did a drop in to some hole in the wall judo school. the teacher was a national champion and the guy noticed the teacher asking this 17 year old kid to spar with him. the kid goes all out trying to throw him, but the teacher counters more and more and throws him harder and harder. the teacher then yells at the kid for failing his throws, and for not knowing the simple counters. they go at it for bout 20 minutes till the kid is exhausted. to the kid this is torture, but to the sensei, the kid will one day be a champion and insid he knows the kids got what it takes, and all this abuse would have been worth it. then the kid may see potential in someone else, and the cycle will repeat itself, just wondering whether you have noticed this bias yourself, are you the target of your instructors bias, or if you're an instructor do you have a bias?