One downside is that wildcards that will be added late will have an obvious advantage compared to others, having to sing less to potentially win The Masked Singer.
I mean, Wayne Brady didn’t even get his trophy for a good while after he won, so I can’t really be mad about anyone having an unfair advantage unless it’s related to singing ability.
With that said, I’ve talked a lot over the years about how The Masked Singer is a fairly low-stakes competition and that the Fox series has always been more about the mystery than a legitimate competition.