i totally agree with you. every team has a different structure to their roster and the way they play. we will obviously see prx players high up in these results because their entire style is based up on how easily can they benefit over the util they have expended and the trades they get in doing so. they push a certain region with a lot of util and manpower and get a kill, if they fail to get a kill , they basically have failed the objective. and thus every time they get this kill, the resulting impact is high. however, for a team like fnatic, even if they dont get control of a certain region at first or get the first kill, they still can build up the round from a different part of their arsenal, they dont really have to rely on these "impactful" frags.
also, you are probably the smartest NA user i have seen on this site