You need playing time to prove yourself. Don't look, but Houston has a pretty solid history of players who crushed the minors and were never really given a chance to prove themselves at the ML level. Kyle Tucker, J.D. Davis, Fisher, Tyler White, Domingo Santana, Jonathan Villar. Davis, Santana and Villar all excelled in other organization once they were given a chance. Tucker's still considered a top 15 prospect who's stuck in AAA and now White and Fisher have a chance with new organizations.
Fisher clearly has pop. You can say he's in the PCL, but wRC+ is league adjusted and he's well above average. Give him a f***ing chance.