But not every case gets that kind of attention, other observers point out. A few revisited cases, they say, isn’t yet a sign of lasting progress…. “One or two high-profile cases,” Kaplan says, “does not make a sea change.”
A case is a thing. Cases is how we talk about more than one of those things. So “a few cases” are something. You can’t say “a few cases” is something. Can you? Maybe I’m wrong.
Kaplan (whoever Kaplan is) proceeds to go the same way. “One or two cases does…” If you invent a new category — “one or two cases” — then that category is one single thing, I guess.
But it/they read/reads awkward/awkwardly to I/me.