It's not out of the realm of possibility.

[They're all here. Alphonse just recently arrived. There's nothing to say that anyone from their home couldn't show up. And Greed deserved that chance.

She makes a small noise that's hard to determine, somewhere between a snort and a sigh.]

That is the important part. But some people believe that what they were first taught is the only truth, and aren't easily opened to new ones.