Miami even if they lose will remain 3rd seed.
Who is supposed to challenge the Cavs?
Detroit even with their inexperience is a formidable matchup for the Cavs, If Boston gets 4th seed, which I think they will, then they will likely play Cleveland in the 2nd round. Then probably the Heat.
Detroit, Boston and Miami all have teams that can challenge the Cavs, but none of them really have the playoff experience needed to take advantage of the advantages they have. Detroit and Miami in particular have the correct matchups on the floor to exploit Cleveland