Each fighter has to be elite, and then he also has to have an elite mate.

The odds of getting an elite fighter would be low, having a mate as well of elite status would be statistically lower still.

IFF elite is 10% and the soldiers were all gay and only dated within the army then there would be only 1% who would be an elite paired couple... much less if they aren't all gay, all dating other army blokes or indeed all aren't dating...

This is more a maths exercise not a 'They are all gay.' they might just be good friends.