Well, we're close to agreement after all. The decisive influence on Beethoven in Bonn was his exposure to the works of JS Bach. I simply want you to accept that in addition to this he would have received musical tuition during the 10 years or so he was there from the principal teacher of the Bonn Kapelle, Luchesi.
As to whether Luchesi was one of the greatest musicians of the 18th century, I have heard various works of his (most of these, for sure, from around 1770/1) including some 7 church works, a keyboard concerto and two symphonies.
Luchesi is a highly sophisticated composer and I recommend you hear some of his music. When you consider what survives of his that is indisputably his (many works today attributed falsely to others) was written long before Mozart's maturity and at a time of great change within the European musical scene you will, I'm sure, rate him very highly also. The works of Sammartini, Luchesi and others are undoubtedly the true origin of the 1st Viennese school, this later supplemented by others from Eastern Europe who had been greatly influenced by Italian theory.
Regards
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