2 random players from the same league have a link but for instance an Iniesta has a red link to Messi.
It does not make any sense to me. They kept this system since the introduction of Fut and i honestly think they need to bring something fresh into the mode next Fifa in terms of chemistry.
Maybe take off chemistry as a whole and give the Managers a few more functions so that your team has a high chemistry instead of just linking players in the same league/same nation with eachother.
I dont know... just a random thought