Thats an awesome start and would be cool! I think ideally there should be some sort of combination of kills per week, frag rate, and kills per hour.
Some sort of formula, and list the top 10 or so.
Need to include kills per hour because people can camp and get massive fr and people like that quite frankly degrade this game and deserve to be shunned not glorified.
For example this would produce a true listing of what I at least consider a "top" player.
Taking all those into account you rule out or at least penalize people who camp like tards. People who have no job or life and play all day. AND take into account good team work. ie score to roe.
There should also be a minimum kill count, and time played to qualify as well. - to rule out someone getting 1 really good round lol.
Give equal value to those 3 stats, and penalize for score to roe ratio or something
I think all that needs to be taken into account where as "top kill" merely symbolizes any decent player who happens to have the most free time that week. Ya know what i mean?