Who is this Contractor?

The Neilson saga of Northern Mississippi is possibly creating an even larger web of lies. 

The public relations war between disgraced former U.S. Attorney Jim H. Greenlee (pictured) and indicted FBI Agent Hal "The Canary" Neilson has escalated.  Last week, when discussing the secret property partnership Neilson allegedly had in a building and for which he was indicted, we pointedly asked:

How did Greenlee's office learn of Neilson's financial interest in the building?

Now an answer has been given in an article in The Oxford Enterprise:

Sources also say that Neilson’s part ownership of the FBI building was discovered after a local contractor tipped off the U.S. Attorney’s office.

So now we ask: Who is this local contractor? What is his relationship with Greenlee's staff? Does he have some connection to the other three partners of the property deal?

Greenlee looks like he set Neilson up, recused himself, and then kicked the ball over to Louisiana (which eventually indictedNeilson).

And now, are we to believe the U.S. Department of Justice's entire investigation is based on the allegation of a single building contractor?  How did he know? 

This smells dirty. Real dirty. Mississippi dirty.