Why different prices for examination?

[dedulya37]

ACG, let non-believers "are right" after the death of the direct heirs of the artist - the widow and children. Who besides them can say whether the work was kept in the family or not.
In the description of the catalog, right reason Falk said: "Most of the work on the dating and attribution of works, most of them at that time still preserved in the family of the artist, was carried out ... connoisseurs of art Falk - DV Sarabyanovym and A. V. Shchekin-Krotov . cataloguers significantly supplemented and clarified the movement of collections of paintings, the current location and participation in exhibitions. "
And further: "Many of the paintings reproduced provided with documentary commentary artist's widow AV Shchekin-Krotov.
So how do you think it is reasonable to attribute the artist's widow falshaki brush husband?