By suggesting Forkel instead, Robert selects to ignore music paedagogue and lexicographer Heinrich Christoph "Koch", who recognised Mozart's mastery in his "Haydn" quartets, 1785 (In Koch's "Lexikon", around 1793).
After hearing them all, Haydn made a now-famous remark to Mozart's father Leopold, who was visiting from Salzburg: "Before God, and as an honest man, I tell you that your son is the greatest composer known to me either in person or by name. He has taste, and, what is more, the most profound knowledge of composition."[3] The comment was preserved in a letter Leopold wrote 16 February to his daughter Nannerl.[4] (Wiki)
But then, Robert refuses to address any relative (to "Koch") issue, including Krause's correspondence (because of the unfortunate "Carl Ludwig Cocceji")
On the subject of "Koch" sharing the same music principles (melody vs harmony, ie Rameau vs Rousseau/Grimm or the buffon debate, later "Gluck" vs Piccininni) with paedagogue-lexicographer "Rousseau", see
http://www.fedegarcia.net/writings/period.pdf
But then, again, Robert wants us to believe that "Rousseau's" alias "Philidor" supported Rameau's principles.
IE
a)"Koch" was a master chessplayer.
b)Robert is a faithfull servant of the Music Industry!!!
...and the identity of the London "Bach" is still pending!
