I agree with snarlatron. I don’t think these rankings (either individually or aggregated) are necessarily very appropriate for choosing an American college. Maybe they are if you want a university with very heavy research emphasis. If you want a broad liberal arts education with a lot of faculty engagement, not so much.
But even if you do want a research-heavy environment, aggregating 5 similar rankings probably isn’t better than breaking down one good ranking to focus on your general or specific area of interest. At least a couple of them (THE and USNWR) do provide graduate-level subject rankings. UChicago for example probably would go up for Social Science but down (and out) for engineering.