Strange Medicine wrote:I don't know why people need to grill Augeri, Arnel, and JSS. Guess if they're Perry impersonators, Perry's a Sam Cooke impersonator.

That's because you're confusing impersonation with influence.
Perry was influenced by Cooke (among other soul singers), taking their stylings and mixing them with his own artistic and melodic choices. That's how most artists evolve. They learn from those who came before them, but an original musical artist builds upon what they've learned, thus evolving the style and creating a sound which, while it might remind you of Cooke, there's no confusing the two. This has always been the general consensus regarding Perry's vocals (Cooke's own family hold Perry in high regard). Rod Stewart is another example of a Sam Cooke influenced singer. Same situation. Led Zeppelin is another example. All they were doing was playing the blues, but their unique spin and meshing of their influences created something unique, even when they were covering songs originated by other artists.
No one confuses Perry and/or Stewart with Sam Cooke but most acknowledge they learned from him.
Augeri, Hugo, Jeremy and Jason Kelty are Perry vocal impersonators. Most have good vocal chords but their artistic choices are mimicking what Perry originated. I wouldn't put JSS in that category. He sounds nothing like Perry except when he intentionally slips in a Perry phrase styling here or there. That's not unusual and even expected when a singer karaoke's a Perry song. You'll notice on JSS original material, he sounds nothing like Perry.
The grilling comes from a lack of respect. Most people don't respect an impersonator no matter what kind of talent it takes to do the impersonation. This is because it takes even more talent to come up with something so unique that it is original. People respect that.
Take a painter for example. Someone could study every nuance in Da Vinci's paintings and reproduce it to the point of mistaking the original from the forgery. But what would an art buyer want to own? The forgery or the original?