Is the prospect haul going to be siginificantly better than the draft pick compensation pick we'd get giving Harper a QO?
It will help the team significantly sooner, if that matters. I don't know that it's significantly better or worse, but you can choose players that will help the team as soon as 2019 instead of 2023.
Harper helps our chances significantly to win the 11 postseason games we'd need to win.
Yeah, I just disagree with this fundamentally. Once you get into the playoffs I don't think a single player significantly helps or hurts your chances (maybe an ace pitcher, but certainly not a hitter). Jose Altuve OPSd .670 in the World Series, George Springer twice that. I think any team that makes the playoffs probably has talented enough players to get hot.