Captaincy according to seniority is such a stupid concept.
The only player out of those four who got leadership qualities is Araujo.
It isn't by seniority but by player's voting.
It is the best way IMO, but I think we need to stop doing the 4 captain thing.
Players probably take it easy when they vote for a 4th captain, and they lean a lot towards seniority in such cases.
Also by the time that guy became team captain half of the squad is changed.
I mean Xavi was 3rd Captain in 2004, he became team captain in 2014 when not a single remaining squad player who voted was still there, maybe Iniesta if he was in the senior squad.
Roberto was voted 4th captain in 2018, this is the squad that voted for him:
en.m.wikipedia.org
Stegen, Dembele & maybe Lenglet are the only players who had voted in 2018 that still there to see him as team captain.
I can see why players will put too much emphasis on it. But this time there is Lewandowski who is a bit new but has that age and accomplishments in terms of seniority.