hmmm i think kakashi vs gai would end in a tie. after all they been fighting a long time and liekly know alot of each other moves. also kakashi liekly copied most fo guys normal hand to hand combats moves so there tai-jutus be even wiht each style wise. unless gai vastly more in shape then kakashi(and i do not think so after the 144 i think anime) kakashi shrigan be reduced in use cuase gai jsut watch his feet and not fall in to any gen-jutus kakashi might use.