I once read somewhere that after Lou's death, Bud Abbott could never get over it and became pretty depressed and withdrawn over it.
Of course he couldn't... Costello was the reason he did so well. When they started their act, Bud was the senior man and took a larger cut of their salary. After a few of their movies came out it was plain to see that Costello was the main draw and they switched the salary percentage. Supposedly, Abbott never forgave Lou for that. They feuded frequently.
