The point is that Moyes made Jagielka captain with a few games to go in the season when he'd already announced he'd leave the club. He had no right to saddle the incoming manager with him. It was not impossible for Martinez to strip him of that armband on arriving, but diplomatically it'd have been unwise. That's how we got lumbered with a captain that should never have been captain.
Martinez could have easily taken the armband off him
Koeman is thinking of selling him FFS
Again though, I don't think there was a better choice for Martinez anyway, outside of maybe Barry and I wouldn't want a, then, loanee as club captain
What he should have done was keep Jags as Captain for 13/14 before passing the mantle onto Barry when he signed full-time in 14/15, or gone with an outside the box choice such as Coleman or Jimmy Mac
Jagielka was imeasurably the best choice when he got the gig and was also the best choice when Martinez first got here (Unless Martinez was prepared to keep Fellaini, which I couldn't see happening as Fellaini didn't fit his "vision")