Al Oliver was only with Montreal for two seasons but those were excellent offensive campaigns, which saw him win the National League Batting Title and lead the league in Hits.  Oliver was an All-Star both years and also led the NL in doubles both times.  Had he been a better defensive player (or at least not a liability as he led the NL in errors for a First Basemen both years) he would have been ranked much higher.

In the last fifty years, Stephen Strasburg was about as highly prized a pitching prospect as there was.  Strasburg has famously had his pitch count watched (even keeping him out of the 2012 Playoffs) after coming off of rehab of Tommy John surgery and the overall protection of the former number one draft pick might be the most of any player in baseball history.

The perceived coddling has paid off as Strasburg has represented Washington in three All-Star Games and was a second runner-up for the National League Cy Young (losing to his teammate, Max Scherzer) in 2017 where he was the league leader in FIP.  To date, he has given the Nationals five 15 Win seasons, and last season he set a career-high of 18 Wins, which was enough to lead the American League.  Strasburg would take the Nationals all the way to a World Series Championship, and he won five games in the post-season while also securing the World Series MVP.   He had not pitched much due to injuries over the last two years, but we would not bet against him.

It sounds like the Nationals had it right all along!

Gio Gonzalez had a great first season with the Washington Nationals in 2012 where he would become the second runner up for the National League Cy Young Award and lead the league in Wins, FIP and SO/9.  While he has not yet replicated that All Star season he has been earned his rotation spot earning double digit Wins every year since joining the Nats.  In 2017 he would again finish in the top ten in Cy Young voting (sixth) while going 15 and 9 with a 2.96 ERA.  Gonzalez would be traded in 2018 to the Milwaukee Brewers but his run in Washington was strong and he deserves this high spot on the list.

Jeff Fassero did not debut until he was 28 and two years later he worked his way into the Expos starting rotation.  Fassero would finish ninth in Cy Young voting in 1996 and overall as an Expo had a 58 and 48 Record with 750 Strikeouts and an ERA of 3.20.