Hiya Prawncracker --
Yeah, I saw Goshposh's message before I posted. I think it comes down to your definition of the word "understudy". Or more importantly, MHC's definition. But no matter what that definition is, what we're talking about is more than one performer being authorized to perform each Muppet.
It means, even if MHC only hires the absolute best performers, you still won't ever know for sure what you're going to get from any given Muppet appearance. Instead of Dave's Gonzo (or as the rest of the world knows him, "Gonzo"), you could see Jason's Gonzo, Michael's Gonzo, Inigo's Gonzo or Michelle's Gonzo.
Each performer can't help but put his or her own spin on the voice, manipulation and characterization. And each performance -- whether on TV or live in person -- is going to affect how members of the Muppet audience perceive that character.
Think of the risks of putting understudy performers inside the classic Muppets: They could contradict Muppet continuity. They could contradict character traits. They could make an off-color joke. They could even just go stone cold blank mid-show. MHC can't control these factors during a performance any more than Martha Stewart can control Miss Piggy during an interview.
Imagine this scenario: You're a 19-year-old kid with a lifelong dream to work with the Muppets, and whaddya know, you've just passed your final callback audition to understudy Miss Piggy. Eric's in Vancouver shooting a Muppet Halloween special, and MHC needs Piggy to do a Pizza Hut commercial. So you're on set, and you've got the pig up, and a props person hands you a ham and cheese pizza. The line on the autocue says, "Mmm, even the bacon tastes good!" You get a weird feeling in the pit of your stomach. "I don't think Piggy would say that," you say, but the director replies, "She says it in the script, so she says it in the take." This is your first shot at playing Miss Piggy, the biggest break of your life so far -- maybe the last chance you'll ever get, and the whole film crew is waiting on you. What do you do?
Do you keep your mouth shut and just hope it turns out okay? Or do you stick to your guns and refuse to do the line, even if it means getting fired? Remembering that if it does cost you the job, that's gonna make the choice much easier for the next understudy in line.
These are all real issues that will come up under the understudy plan. I'm not worried about whether Steve or Eric will lose their jobs. But I am worried about whether the Muppets will lose their souls.
Kynan