So you would classify Villareal in the same group as RM, AM and Barca?
You are really getting worked up on a term that has no defined set of what it has to be. There could be 3 top teams 12 mid level teams and 5 bottom teams. Nobody said each group has to be the exact same number of teams. In fact doing so would be a stupid way to judge them.
i will change it to 2nd tier team if that makes you feel better, doesn't change the point at all but maybe then you take a breath and get over your pedantic concerns with the wording used to point out the FACT they are not a top La Liga team.