From Frangraphs:
Regarding Thomas La Stella
Since last week’s edition of the batting leaderboard, Atlanta infield prospect Thomas La Stella has recorded seven walks in 18 plate appearances — all this while striking out zero times. For La Stella to control the plate so well isn’t an entirely suprising development. He posted walk and strikeout rates of 11.5% and 10.5%, respectively, in 323 PAs at Double-A Mississippi. He’s posted similarly excellent rates at other levels, previously.
If one takes for granted his plate discipline and what appears to be below-average second-base defense*, then projecting La Stella as a major-leaguer becomes a matter mostly of targeting his home-run rate (HRC%) on contact and BABIP.
*Note: the author isn’t suggesting that one ought, necessarily, to take either of these for granted. For the sake of the minor experiment below, however, that’s what’s happening.
Below are four possibilities for a major-league version of La Stella, if one controls for everything but HRC% and BABIP. The walk and strikeout rates included here are those projected by Steamer for 2014. The defensive constant presupposes either a -5 defender at second base (Dan Uggla, basically) or a +5 defender in left field (i.e. another destination for defensive misfits).
Line PA BB% K% HRC% BABIP Fld+Pos HR AVG OBP SLG Off Def WAR
1 550 7.3% 10.2% 1.5% .280 -2.5 7 .260 .319 .360 -6 -3 1.1
2 550 7.3% 10.2% 2.5% .280 -2.5 11 .267 .325 .396 0 -3 1.7
3 550 7.3% 10.2% 1.5% .300 -2.5 7 .278 .335 .378 0 -3 1.7
4 550 7.3% 10.2% 2.5% .300 -2.5 11 .284 .341 .413 6 -3 2.4
Line 1 represents La Stella’s 2014 line according to Steamer, more or less. A 1.5% HRC is what La Stella recorded in 2013 at Mississippi, as well. Line 2 features 2.5% HRC, i.e. what La Stella has posted over the entirety of his minor-league career. It wouldn’t be surprising, necessarily, for La Stella to hit for more power, either, as he advances toward complete physical maturity. Line 3 features La Stella with his Steamer home-run projection, but with a major-league average BABIP. Not an impossibility, that. Finally, Line 4 is an example of La Stella recording the more productive versions of his HRC% and BABIP. It’s probably hard to get much more reasonably optimistic than this final example, in terms of La Stella’s true talent.