I’ll go over four potential players that could replace Eddie Rosario if the Twins were to ever trade or non-tender him.
Kirilloff, probably the most likely option, and my preference for a replacement, is the Twins #2 prospect. He had a good 2019 season with the Pensacola Blue Wahoos (AA). He slashed .283/.343/.413 (.756 OPS). He hit 9 home runs, 18 doubles, 2 triples, and had 43 RBI. He posted a .347 wOBA, 121 wRC+, 7.1% BB%, and a 18.5% K% in 94 games (411 plate appearances).
Larnach, probably the second best option for a replacement, is the Twins #3 prospect and had a great season with the Fort Myers Miracle (Adv. A) and Pensacola Blue Wahoos (AA). I’ll use his stats from AA to make this simpler. He slashed .295/.387/.455 (.842 OPS). He hit 7 home runs, 4 doubles and had 22 RBI. He produced a .387 wOBA, 148 wRC+, 12.2% BB%, and a 27.6% K% in 43 games (181 plate appearances).
Cave will have more stats because he was in the MLB for most of the season. Cave had a decent 2019 season with the Twins, slashing .258/.351/.455 (.806 OPS). He hit 8 home runs, 11 doubles, 2 triples, and had 25 RBI. He produced a .343 wOBA, 113 wRC+, 9.2% BB%, 31.1% K%, and a 0.9 fWAR in 72 games (228 plate appearances). Defensively, he had a -2 DRS, -1.5 UZR, -2.8 UZR/150, and 2 OAA.
LaMonte Wade Jr.
Wade Jr., probably the least likely replacement of these four, will also have more stats because he spent some time in the MLB. Wade Jr. made a decent start to his career in the MLB with the Twins. He slashed .196/.348/.375 (.723 OPS). He hit 2 home runs, 2 doubles, 1 triple, and had 5 RBI. He produced a .320 wOBA, 98 wRC+, 15.9% BB%, 13% K%, and a -0.2 fWAR in 26 games (69 plate appearances). Defensively, he had a -1 DRS, -3.5 UZR, -39.9 UZR/150, and a -3 OAA.
I would guess that the main competition will be between Kirilloff and Larnach because they are younger, better, and have more potential than the other two, however that doesn’t mean that it isn’t impossible for the other two to possibly be short-term replacements.