I can count basically every opponent move even on 0% WR setting and analyze couple of scenarios to conclude what is best response.
do you create new game for test scenario? or you try to visualize those scenario in your mind?
and if yes how many times it usually took?
how many time it take for count turn by turn the hidden deploi of your opponent?
that's are the right question i believe. IF you need probably more than 3/5 minutes, then i am probably right about what i've said :P
Other reason is, that someone can be in top form or not. Like for example after having successful ladder run, I can guarantee you, that player will be 2x more dangerous, than after 1 month of break.
i would like to say that i am NOT referring to any specific run, nor your last 1v1 run, but usually the ladder run are luck based (and i am not speaking of luckinside game only)
all i know is, that doing well on the 1vs1 ladder doesn't measure skill as good as it did before. i'll have to find another way to determine someones skill Level very fast (for example MASTER recruiting). Before i could trust the 1vs1 rank. It showed someones skill pretty accurately (also taking Speed, amount of games in account)
i do agree that in mid skill level isn't a good measure of skill anymore.