From the TIE Striker preview:
...so what we're looking at, here, is a pilot able to maneuver high fighter so hard that it takes frame damage ...while dodging an enemy's entire attack.
Best maneuver other (human) pilots have in the game? Just taking an 'evade' action to block one damage.
'Countdown', though, can dodge so hard he blocks all damage in a maneuver so extreme his fighter cannot handle the stress ...but he's alright. Just gets a bit stressed as a result, no harm done.
Conclusion? Clearly, 'Countdown' isn't a human pilot. Have to be someone more stout than humans - smaller, stronger.
Headcanon? 'Countdown' is an Ugnaught...