the thread is called "best of 19s", not "who is the best at playing 19s." In my interpretation, the thread is asking who, of the players in the 19 community, is the best. I like to factor in peoples' skill at 90 when I consider them as one of the best players in our community...
let me try to clarify with an example. it's like asking "who is the best athlete" in a baseball league's forum. you can answer the question based on how good that person is at baseball, sure, but I'm also going to consider how good they are at football, soccer, hockey etc... because I think baseball, by itself, doesn't tell much about someones athletic ability. thus, for a more accurate answer, I reference other sports for better information. in this example, baseball is the 19 bracket, and other sports represent the 90 bracket.
NOW, if the question was "who is the best baseball player", then i would not factor in those other sports. such is the difference between a "who is the best of the 19s" thread and "who is the best at playing 19s". In the end, it is really up to your own interpretation of what "best of 19s" means. As I stated above, I think it means "who, of the players in the 19 community, is the best", and I think being the "best" encompasses more than ability on a level 19, hence why I first responded in such a way to Giliese's initial question of "what do you consider when writing the lists". Hope that makes sense.