This is 100% Miguel, those who say it's not clearly don't listen to him on a regular basis to distinguish what his voice sounds like. It's distinctive, this is him. period.
Anyone who doesn't think this is Miguel see the RU-vid video "Miguel - Black Ice Records Artist Profile" he sings it at the end. He was really young, this was when he was with Black Ice so of course he sounds younger, but it's still him.
@IttyBittyOnTwitter lawsuit he tlkz all bout it and thiz my nigga so i noe hime like dat but he werote songz for lots of ppl like mary.j.bloge and usher... ect.