Re: Arenado,
Who are the last two Rockies to play 150+ games at the age of 22?

One is easy, the other "shocking"

BP has some pretty good guys, although losing Goldstein hurts. Hulet's also pretty solid for FanGraphs, and Jonathan Mayo drives MLB.com's effort. Yeah, they may be a cut below BA and Sickels, but I'd group them with Law on the next tier. I think there's some value in almost every such list, especially in identifying potential sleepers.

I like reading Parks; not only is he a good writer, he has his own perspective, and I find that useful. He's similar to Law in that going and seeing a player plays a big role in his thought process. But the top 100 isn't just his list; it is the consensus opinion of the whole "prospect staff," most of whom have not shown any reason for me to care what they think.

Mayo is a journalist who aggregates scouting info. I've never gotten the sense that he's adding anything unique of his own (not necessarily a bad thing). That's not worthless, but it's redundant if you already have BA. His rankings end up fairly different than other outlets, but different doesn't mean useful. Again, the individual team writeups are more interesting, since it can clue you in on guys that have piqued some scout's imagination somewhere, but we are just talking about the top 100. When it comes to value ranking my prospects in my preposterously deep dynasty league, those top 100 lists don't really add anything beyond BA and Sickels.

Hulet... I've been reading him off and on since his Baseball Analyst days, and I've never found him particularly useful. I mean, his info is fine, I suppose, but it has always struck me as just a watered down version of what you get elsewhere, even in his team writeups. He's like the megablocks of prospect guys. He's fine, I guess, if that's all you have; but if you have legos, there is really no point to him. He's redundant.

I don't find "different" choices to be useful as sleeper pick unless the guy naming them as a sleeper has some cachet. I mean, anybody can just throw some crap at the wall and see what sticks.

43. Mariano Rivera -- he needs to develop an out pitch but should be a serviceable #4 starter

44. Marco Rubio -- noted Cuban and South American player rep thinks he has skills. Not sure if he can go right, however.

@53 - If he could have been a serviceable starter they would have made him one by now. A reliever shouldn't even be allowed in the top 50.

Who are the last two Rockies to play 150+ games at the age of 22?

One is easy, the other "shocking"

Since no one guessed, I'll say Tulo and Neifi Perez.

I had to look up which BTF whipping boy Perez had greater value, Timo or Neifi.

From BBRef, Timo's 0.8 > Neifi's 0.7, in 1/3 of the games.

In a humorous side-note, King Kauffman sponsors Neifi.

EDIT: Measurement is WAR, in case that isn't obvious.