I don't agree. Adams was a great captain and I remember reading Dixon saying how before his first North London Derby Adams had him up against the wall (

) making it
very clear to him how important the game was. It's more than leading by example (which our recent captains have done), it's about leading the team on the pitch.
A for example was vs QPR, Santos' positional sense is all over the shop but I didn't once see Vermaelan yelling at him, telling him to sort himself out. I do think it's quite important and something which we've lacked at times in the last few years. When things aren't going well out there you need a strong captain to gee them up and sort it out.
That said, things like "Wenger doesn't believe in captains" and the idea that our players don't care about losing is pure Zimmshit.