why he withdrawal is simple : when he withdrawal and position is in profit. fxbook show win % much more than is reality. example : 10k deposit and position is +500 ... normally this is 5% but if you withdrawal 9500 now is profit 100%. so he close make '100' % and deposit back.... gain is big but real profit is only 30%.
with this thing, everyone with position in profit and broker what allow internal transfer can make 10 000% every day...only deposit 1000 usd make profitable position 100 usd and withdrawal 999 usd from account... done. you are master of trading :-D
i am user in bestforexrebates dot com