Tom, to go back to the Rivera discussion. He got $725K, so obviously we shouldn't assume stardom. But that's more than guys like Sanders, Hope, Carico, Rosario, Melendez; Birdsell; Franklin; Luke Little, all guys drafted with hopes that they'd turn into major league contributors. Definitely drafted for more than minor-league roster-fill.
1908, my impression is that his defense is very good. Good enough for big-league SS, or 2B, or 3B. *IF* he can hit enough to be a major leaguer, his defense will be an asset, especially if serving in a utility role.
So yeah, Tom, as you said he was and should be viewed as a prospect. Might become a major leaguer, but no compelling expectation that he should become an excellent one. *IF* he was to turn into a good big-league utility guy, but never an asset starter, that would hardly profile as a "fail" pick. And if he never reaches the majors at all, most 3rd-rounders or sub-million guys never do.
I do think old senior-signs are especially vulnerable to "weeper". Rivera will turn 24 before the World Series. Teen picks like Paciola, Rosario, Melendez, they get a couple of years to try to figure it out. But if Rivera can't hit this year, he won't get much leash to remain viewed as a prospect.