This has been covered. MEP is a strong 4.0, but regions vary.Someone's lying somewhere. He says he's 4.5 yet he crushes another 4.5(MEP) in singles indicating a full level difference.
Atlanta 4.5 is really a Milwaukee 4.0 due to lack of 5.0 level players in smaller markets.
Mark Sansait is more typical of a typical 4.5 player, not MEP.