You dont know how much higher he ranked above you in k/t
even a few points .00021 to .00018 could mean a huge difference in where you rank in that category.
the .00021 guy could be ranked 100 while the .00018 guy could be ranked 175. just in kills per time online
so if your k/d rank is 1 and k/s is 1 and you k/t is 175 and your point rank is 1
add all 4 = 178
now im k/d 10 k/s 10 k/t 100 and point rank is 10
then thats 130
130 would be my total rank score there for I would be ranked higher then you.
EDIT
actually theres 5 categories fer fighter rank but you get the picture ...............

Thats how its seems that k/t has such a greater effect. that category is "tighter" then the rest especially in relation to k/d.
Total rank and squad ranks are this way as well. They are determined by adding all 4 (fighter, buff, attack and gv) add all 4 up if its lower then everyone else you'll be ranked 1st.
you could be 1 in fighters 1 in attack 100 in buffs and 1 in gvs
total 103 (this is not your rank but your total score if no one scores higher then 103 you will be ranked number 1)
now I could be 25 fighters 25 attack 25 buffs and 25 gvs I would rank higher then you.
total 100
Being number 1 in just one category (whether total rank or fighter rank) wont mean your rank will be high.
Thats why if you want to track your scores being able to check where you fall in line in each category then would be helpful
htc would need to improve the score pages to show not only general score like overall fighter rank etc..
but where you fall in each category k/d k/s k/t and points. That would eliminate all scoring questions.