What I mean is that it's wholly possible he hasn't missed a minute because of any non-injury related reason, but it's also possible he's been tactically benched at times too. It's far too speculative as we just don't have the insight.
I mean, you can barely trust anything Martinez says in interviews anyway. I think it's just been a problem this season as Martinez has too often put Barkley or Naismith out wide when perhaps he had another winger to play there, so forgive me for not ruling out the possibility that Martinez might, at some points, have chosen to not play Kev when he could have.