That's one risk of doing cover songs - you might never write and perform one of your own to match or exceed it. After that, you have to play the best tune you never wrote lest listeners think you're just phoning it in with your other songs.
You also can't stray to far from the original and your cover version that became popular because listeners now hold you to it, whereas if it's your own song, especially modified over time, fans embrace what you've done with it.
And worse when it wasn’t even their idea and they thought they’d sufficiently tanked the recording to keep it off the record, and instead the record made it the lead off single.
I generally feel bad for Quiet Riot. Banging around for years, Ozzy snags their amazing guitar player, they finally get it all together and their only hit is a song they hate, random deaths. Snake bit band.