I don't think you are going to want to use bWAR here, and now that you have you must acknowledge the consequenses
The difference between Bogaert's defense and Iglesias' defense is only 1.5 bWAR, or less than half of the contributions Bogaerts' gave at the plate in this one year sample size. You get too caught up in the negative number for Bogerts' defense that you tried to ignore that Iglesias defense - his selling point - isn't significantly better and only 1.1 dWAR above replacement level himself.
And really, over the past 3 seasons, Bogaerts has given 12.5 oWAR on offense and 0.5 dWAR. So he is also an asset of both sides as well, right? Over that same stretch, Iglesias oWAR (4.4) is actually better than his selling point dWAR (2.6), which is probably a much less impressive number than many thought Iglesias would receive defensively, and a far, far cry from Andrelton Simmons' 10.2 dWAR in that same stretch.
In fact, I don't think B-R likes Iglesias' defense as much as some of Jose's fans do. It credits more dWAR over the past 3 seasons to the following shortstops: Simmons, Brandon Crawford, Francisco Lindor, Corey Seager, Troy Tulowitzki, and Trevor Story (in less than 2 seasons!!) and has the same dWAR as Elvis Andrus and Adeiny Hecheverria.
And that is from the names I looked at, as B-R.com is a lot more cumbersome than fangraphs for this kind of thing...