There are 29 other teams out there, and yes, at least one will put out younger players.
I’ve never heard of any 5 year minimum rule, but I could certainly see a player taking that long.
Harris and Grissom were both drafted in 2019. No one from the Sox 2019 draft class has made MLB and with the possible e exception of Noah Song none of them ever may make it. But Duran (drafted in 2018) that much different of a story?