The “top Democrats” being discussed in that article as considering an open primary were keenly aware how all of them coming out in lockstep in support of handing the nomination to Harris had the potential to backfire as “king-making” as far as the public was concerned. There’s an explicit quote from Pelosi’s staff about this in there.
This article you posted is about whether Harris would get the nomination and doesn’t name a single other potential candidate, proving my point. What I don’t see in here is anything at all resembling the fictional drama you created above