From SoxProspects:
The Red Sox acquired Marcus Wilson from the Arizona Diamondbacks in return for Blake Swihart and international bonus pool money in April. Though he was drafted in 2014, Wilson is only 23 years old and was just added to the 40-man roster this offseason, putting him on the brink of the major leagues. After he was acquired, Wilson really struggled in Portland, hitting .161/.307/.226 in 75 plate appearances, but he recovered after being moved down to Salem, hitting .342/.413/.603 with 8 home runs in 167 plate appearances. His return to Portland went much better, as he hit .250/.325/.486 with 7 home runs in 163 plate appearances. The biggest concern with Wilson is his hit tool. Even in his successful return to Double-A, he struck out at a 30.1 percent clip. Wilson will show above-average raw power, plus speed, and the tools to develop an average-to-slightly better defensive profile, but if he cannot make more contact it is tough to project him as more than a fringe major league bench player.
If he's striking out 30% of the time in AA and not hitting for monsterous power like Chavis or Dalbec, he'd be ugly in MLB.
For example, Chavis had a 25% k rate in AA in 2018 and 27% in AAA in 2019. When promoted to BOS, he had a 33% k rate last year and is now sporting a scorching 45% k rate this year.
If Wilson got some run this year, he'd most likely have a k rate around 40%. Without extreme power to back it up, that's a nightmare.