Whoa, this is turning out to be quite some topic! If you don't know, I'm the one who posted this in the first place. Anyway, in my personal opinion, I think Yoshi should keep his "Yoshi!" or "Zip-zoo!" sounds, as I'm used to those. Also, Mario can understand the Yoshis because they talk like this. It just make sense.
Oh yeah, if you're gonna post on here, don't be too rude or obnoxious. Ok?