Karen Olivo is an incredibly dedicated, talented, beautiful, actress. I agree it's not her fault that she got cast as Anita, and she's giving it her best, her acting is the best among all the principals, her singing knocks it out of the park, but it'd be unfair to blame anyone for criticizing her dancing (in)abilities. She's just not a dancer and she has admitted to it before.
After seeing Charlotte D'Amboise do that brilliant choreography, after playing Rita Moreno's Oscar-winning triple threat performance over and over, and after seeing other clips, it is clear that Karen Olivo just doesn't have the dance training required to wow us with her dancing the way the role requires us to. Does she manage to still make Anita a wonderful, full-fleshed, beautifully-acted character? Of course! But she does that through her singing and her acting, and so we forget (or forgive) her shortcomings in the dancing department.
That is a wonderful clip, I can't imagine what it must have felt like for those dancers to have the master himself choreograph his own movements for his own show. How I wish I had seen them.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"