I'm with CBK - it's not like Fonte is saying, "well, I WOULD organise the defence, but I don't have the arm band so better shut up"
I entirely see that point of view and agree to a point, but I also feel like, despite the fact you are being facetious, it is almost like that. Of course this is all a lot of speculation like most of what we do as fans, but I believe that there is a great impetus put on the captain leading a team than other senior players, although they obviously play a part. I'm sure Fonte does organise a lot of the defence and is a voice in the team, but I feel like that voice would be stronger and more important if he was wearing an armband, both from his point of view of having complete control of the organisation of the team on the pitch, and from others point of view hearing his words as a captain's words and not a teammate's.