I read an interview where one of her "experts" said that their 3 choices were "daring". They could have gone for the safe route but would rather go for the dangerous route and fail.
The only "dangerous" choice I see is Tabby who may forget his words on a live show. Oh- to be a Rock n`Roll star.

I agree. Tabby is the more 'daring' option, rather than the safer Andy. I think Cassie has such a good voice she was a foregone conclusion.
Roberta also has a great voice, but again, is safer than choosing Megan. (Just comparisons though, Roberta is an excellent singer and is in my top four, I think, however Megan has more edginess and soul in her voice. her rendition of 'fly me to the moon' was really good imo'.)