The question is unclear. The lowest of top five what? If it's top 5 ranks, then the answer is Maegashira- top to bottom it's Yokozuna (1 wrestler), Ozeki (5), Sekiwake (2), Komusubi (2) and Maegashira (32), as of last May's rankings. New rankings are out on June 28th.
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The lowest rank in sumo is that of Jonokuchi. You will seldom see these in any sort of broadcast or newspaper listing. They have completed the basic school of sumo and are just starting to compete.