Willi got a 5 year jump on Ernst on the development of a fighter worthy of production and further development. The He-112 would have to have been replaced in the design stage by the He-100 of 1939. The steam-cooled system would be forgotten, replaced with a common tub as per Ki-61, or something more imaginative with Meredith effect. The wings could be more generous in area. The Me-109 had more area and the Ki-61 increased it over 25%. Maybe the undercarriage wasn't that weak. Maybe it was only the hairy landing speed. Maybe stronger gear anyway.
So all it takes is to realize the mistakes and lessons learned in 5 years in the blink of an eye, and, Bob's your uncle, He-100s are rolling down the production lines. Or Goering hears Willi calling him a fat, ugly, stupid sunnamabitch.