Espinosa hit .268/.337/.464 over 500+ at bats in the AA and AAA his last year in the minors. This year in the majors, he's at .229/.313/.408.
Ian Desmond hit .330/.401/.477 his last year in the minors. He's hitting terrible/terrible/terrible.
Lombo is hitting .314/.364/.442 this year in the minors. Why is he going to be so much better?
I'm all for upgrading from Desmond/Espinosa - I just don't see how Lombo is going to be clearly better.
Ian Desmond minor league career - .259/.326/.388 (31.5 errors per season)
Danny Espinosa minor league career - .270/.365/.455 (19.5 errors per season)
Lombardozzi minor league career - .300/.371/.415 (8.5 errors per season)
Shoeshineboy already covered this, but Desmond has never hit well outside of his last 55 games in the minors. Whatever he did, he has been unable to reproduce. Espinosa and Lombardozzi have better hitting skills. Espinosa is already hitting better than Desmond. Lombardozzi's numbers and consistency in the minors trounce Desmond.
On top of that, Desmond is a poor to below average defender at best. Espinosa and Lombardozzi have just as much range as Desmond, but they make fewer errors. As much as Desmond has improved, it isn't enough and its not much of an improvement. We have better options already available to us.