http://www.uniaodeleiria.pt/index.php?pagina=clubehistoria if you can read Portuguese, União Desportiva de Leiria Official website, it is stated that Mourinho was not the man behind Leiria's best position ever, two other coaches were (in 2000/2001 and again in 2002/2003).  

 http://en.wikipedia.org/wiki/Uni%C3%A3o_Desportiva_de_Leiria Even in wikipedia's entry about Leiria's Club, it is stated that Mourinho was a coach during the 2001/2002 season (only half season, actually, before leaving to FC Porto), where they finished in 7th. This alone is enough to prove inconsistency in the statement I'm disputing!