RBI's are primarily a function of opportunity. Baseball Prospectus took all the suspense out of that debate a decade ago. As for stats like RISP, they're usually just small sample white noise rather than a measurement of a repeatable, measurable skill. While there are probably players who are somewhat consistently above or below average 'in the clutch', it's just random for most players, which is why it's almost never discussed in talent evaluation. And Morneau is the poster child for the meaninglessness of RBI and RISP. He's a 'clutch' hitter, and that's why he's batting .360 with RISP this year, right? Then why did he bat .196 in the same situation last year? Because he forgot how to be 'clutch'? No, he did it because, just like in any other set of 100 to 150 plate appearance, random stuff happens.