The story advancement for Grogu is great. The Armorer being a Co-Star this season essentially is nice and I like what they are doing with her. I'm honestly not sure what you are talking about with Pre-Vizsla. Perhaps I missed something. I also don't care that much about Pre-Vizsla so there's that.
To argue that the story IS moving along would just be making things up and ignoring idiotic writing in some of the sequences of these episodes.
For example:
"Oh no bird just took my kid, better go get him"
"Damn, we ran out of jet fuel, he always gets away!"
These are freakin' Mandalorians, you'd think they wouldn't be so dumb, but then again I watched Book of Boba Fett, soooo.....