2 years before we traded for Tulo
126 games played
91 games played
2 years before JD's free agency
113 games played
36 games played + whatever else he manages this year.
Tulo was 31 when we acquired him, JD will be 34 when he's a FA and nobody knows if his arm will ever return to 'normal'. You can point to what JD did between 2013 - 2016 all you want, but that's old news, especially seeing as he's further down the aging curve.
JD's gone from a 145-155 wRC+ hitter to 107 this year. Tulo went from a 133-170 wRC+ hitter to a 106 hitter the year we traded for him.
Sorry, but I fail to see why you think these situations aren't remotely close.