Exactly why Indiana is our true rival. IU can keep losing. I've been watching Illinois basketball for 17 years now and nothing compared to the Illinois-Indiana rivalry during the Kelvin Sampson/Eric Gordon debacle. Some people will point to Iowa in the late 80s/early 90s and Michigan in the late 80s, but I didn't grow up in that era. I grew up in the era where Illinois' main rivals have been Wisconsin and Indiana.
I grew up on those games in the 80s. Indiana has always been the number one rival. Other teams have come an gone and gone but Indiana has always been hated. The Knight-Henson rivalry was epic.