Yeah, I heard this clip some time ago, maybe a year?
Potts is reminiscent of the fire department guy who got his big break after 9/11. That guy (not Potts) sang on a few daytime shows and morning shows and BANG, he's a big star.
The really cool thing about Potts and the fire department guy is that they're regular people, just like you and me. They have a passion and even a bit of talent and they come out to a show like that one and do well.
I think Potts has some ability and some promise. He's got to get a handle on his nerves (jeezus, don't we all?

) but that comes with time.
The other really cool thing about Potts is this: he comes right out and tells you he wants to sing opera. He doesn't want to sing pop, or crossover, or any other kind of genre but opera. And he does.
Gotta love that.
Grob? He needs to first be able to grow a beard, spend some time in the woodshed, i.e., practicing, get some serious training done, and then come back after he changes his diaper.
THEN he might do well.
If it's one thing that rankles me, it's shake 'n bake stars. Grob is no more a star than I am. He's got to pay his dues first.