In arena and matsuri, the stats are added and divided into 4, but the treasure tools are position specific. The stats coming from the tools are not shared. One way to really compare is to remove the 4 tools from your ninjas and re-capture the total stats. Those are what you have equally divided by 4. The treasure tools then add onto each position individually without sharing.

What i am not 100% on is the 8 gates. 8 Gates are position specific, so maybe they are not shared as well. So his/her 8 gateways between 1,2,3 and 4th position could be very different too. Maybe all lv11 red on position 1.

As for the control, control on the other hand are added and divided equally (again, not sure about the 8gates). Yours average to 7800 each, his/her averages to 7771 each. I would say both controls are too close to really tell, maybe you are just unlucky. Or could be ninja specific, some ninja have boosted ability like susano sasuke's mastery, tenten, tsunade...etc

Am no expert but those are what I have been believing based on what i have read over the years