You can't win them all. Recently Heritage Auctions offered this fine group of rough animation drawings of the character Angus McBadger from the 1949 film The Wind in the Willows. The auction item's description said that Bill Tytla drew these sketches and that they originate from the artist's estate.
The thing is...these are Milt Kahl drawings. This particular film was in and out of production during the early 1940s, and that's when Milt drew them. There is a short window of time between the start of animation on April of 1941 and the beginning of the Disney strike on May 29, 1941. It was then when Tytla left the studio. He must have saved these roughs by the "junior animator", presumably because he liked the vitality in Milt's sketches.
Anyway I did not end up with these terrific drawings, I was outbid. But if the current owner would like to publish them here on this blog, please, leave a comment.
