Who came up with the new BR ranked RP system?

@EshshshssI think I've finally figured it out. That max kp 7 bothered me too because it didn't make sense considering what was written below "9kp".
It took me a while but I understand now.

Ok so here it goes: in the new season they moved away from multipliers and instead changed it to addition. Kp is unlimited.

Max RP you can get from KP is 175.

Max RP you can get from placement is 100.

Max RP you can get from a win with full kp is 275 (this is without subtracting the entry penalty).

For a win in diamond with full kp the calculation would be this assuming you only get kills/assists on diamond players: 10x7(your kp)+ 15x7( 15 is the bonus RP you get for KP and it is tied to placement)+ 100 (this is the flat RP reward that you get from placement)- 48 (diamond entry)= 227 RP

The higher your placement is the less KP you need to get in order to max your KP RP to 175. And those are my calculation:
Full kp for a win is 7
Full kp for a second place is 9
Full kp for 3rd place is still 9
Full kp for 4th place is 12
Full kp for 5th place still 12
Full kp for 6th-10th place is 15

They have said they changed max kp from 6 to 7 but in fact they were referring only for the kp you need for max RP if you win. It's really confusing. But I think I'm 99% right.