SRK in Darr, and it's not even close, plus it was not overshadowing, it was something more, and that's the reason Sunny Deol still talks about it and still isn't too happy about it..!!
In other cases, mostly one actor overshadowed other but it didn't had effect on overshadowed actor themselves, i mean they were good, but other one was better..!!
In Darr though, it actually turned badly for Sunny who was supposed to be the lead actor of the movie..!!
For better example
Amzad Khan in Sholay does not mean that Jai-Veeru were forgotten or Akki in MSK getting more appreciation didn't meant doom for Salman, same was the case for others.
But in Darr........well ask Sunny Deol, he'll answer you better