Freddy Galvis was born in November 1989. He's 27 years old, will be 28 in November.
J.P. Crawford was born in January 1995. He's 22. He's five years, two months younger than Galvis.
Freddy Galvis will be a free agent at the end of next season. He'll be looking for a multi-year contract, probably four-five years. We're talking about his age 29-33 seasons.
Think about the Phillies' long-term plans for contention. Is Freddy Galvis the shortstop? Should the Phillies sign him long-term? Do you think he'd be interested in a short-term extension now, to push back his free agency by a year or two? IMHO, he'd be nuts to do that, unless the short-term gain is huge - because in the winter of 2018-19, he'll probably be able to leverage a nice multi-year contract from somebody; two years later, I have grave doubts.
If Galvis is NOT the long-term answer at shortstop, then Crawford may be. If Crawford is, then he should be promoted into the role as soon as he is ready. Based on his overall 2017 season, that day is not today; but based on his past six weeks or so, that day may well be as soon as next spring. And if Crawford is going to be the shortstop in 2019, then it would behoove the Phillies to trade Galvis while they can, rather than having him leave after 2018, and the organization getting nothing back except a handshake.
So it's not a question of whether Freddy (note the spelling of Galvis' name - I don't know where "Freddie" comes from) is for real; the issue - the only issue that matters - is what is in the long-term best interests of the franchise.