So you are trying to say that Chelsea is a small team?
I think you are wrong if that's how you see Chelsea, though it's rare to see a player that will turn down the advances of real madrid, since it's the biggest team in the world, due to their magnificent records in Europe.
I think he meant that a player faced with a choice between Chelsea and Real Madrid would definitely choose the Spanish side. Real Madrid is a club of the highest prestige, as are Barcelona, Bayern Munich, Liverpool and Manchester United. Players will always say ‘yes’ to these clubs; they have a long-standing history of financial and sporting stability. Other clubs, such as Chelsea, Manchester City, Paris Saint Germain and others, have enjoyed stability over the last 20 years, but they do not yet have that same prestige.
I agree with you that real madrid are a level above the rest of other teams in prestige, and players will hardly say no to them, but the other teams you made mentioned cannot pull the same weight like real madrid, and it may surprise you to know that the players of these teams also sees moving to real madrid as a dream move.
So in essence of what am trying to say is that, it's true that players will always choose real madrid over Chelsea, if it's between Chelsea and real madrid, but the rest of other teams can't bully Chelsea in the transfer market like real madrid can do.
We have seen in the past how most players will prefer to going to Manchester City, Chelsea and PSG over Manchester United, Barcelona or Bayern munich that has an incredible history, so it's best to say that it's only real madrid that can bully these teams, because Manchester United, Barcelona or Bayern munich players are also a prey to real madrid.