Why would a probation officer add Cochran to the attack on David Dupray when Dupray didn't say that. He told the officer that it was Percy Sargent?

Attorney Silver while trying to show the judge how Dupray feared Percy Sargent linked Percy to the arson of Dupray’s cottage and Mike’s murder. I believe Attorney Silver along with many other attorney's in the Bangor area and law officials as well knew that Percy Sargent was involved in Mike's murder.  I called Mike's attorney, Andy Mead, for help in finding out why Mike was murdered and he advised me to "stay away from that, Mrs. Cochran."

Mr. Silver told the court that there were two co-Defendants in this transaction. Silver said they both had very long criminal records. One was DEA informant Percy Cote who had a very long criminal record with many convictions for trafficking and other crimes. Silver said the other one was Percy Sargent who  received two years which was concurrent with a sentence [of rape]  and that Sargent had a very significant record, a very long record.  Silver said Dupray did not have a record like his two co-Defendants. Knowing how Judge MacInnes sentenced Mike to 6 year for his first drug arrest would Dupray get a break from this judge.

District Attorney Almy tells the judge that "we are talking about ten pounds, and you sentenced Percy Sargent. You heard what Percy Sargent said happened. Now, we hear a different version from Mr. Dupray...  I take it that DA Almy would rather take what Percy Sargent said happened.  I wonder why Almy and the Judge were so lenient toward Percy Sargent, this dangerous criminal.