Believe it or not, Willi has now been in the system five years, including three pre-Hinch, during which he suffered at the hands of development personnel who weren’t knowledgable enough to even develop a complex about how inadequate at development they were.
Willi might possibly be too far gone to fix well enough to be a major league regular, but he’s also probably a year too young to completely give up on the idea. Best option I can think of is, once the other outfielders come back, give Willi the rest of the year at Toledo (or Erie!) for an extensive development regimen that includes outfield reps—one last gasp to turn him around. If he doesn’t show significant enough improvement a year from today, DFA him.