<p>I did this analysis when entering grad school, at which time the top 4 schools did include Caltech. In any case, it's silly to quibble over "top 4" or "top 5" schools when clearly Caltech is much better at UIUC in faculty placement. My theory is that the reputation rankings reflect both quality and quantity. UIUC has five times the number of faculty as Caltech, so their research is much more visible.</p>