No but it's...

the way they naturally fall into eachother's roles when the other isn't there.

the instinctual head-tilt when Crosshair stabilized his rifle on Tech's shoulder, as if they'd done it a thousand times before.

It's the fact that Tech clearly told Phee all about his brother.

It's the sad, fond smile on Crosshair's face when Omega said Tech made her memorize all the plans ("of course he did").

It's the way Tech knew exactly where to look for that mirror.