Mina has told pals that the real clincher was a personal chat with Silva who rang him to tell him why he should join Everton.
Jose Mourinho did not contact the defender as scheduled while United fretted about finding a centre half - and he blamed his bosses for failing to land their targets.
Mina was puzzled by the lack of contact from United or their boss. He came back to Barcelona from a holiday expecting to head to Old Trafford after they met his agent.
The Colombian is yet to be involved in a matchday squad for Everton since his £28.5million move to Goodison Park due to a foot injury.