I think Anna's name changed to Anna Turner (in this episode) from Anna Daily (I believe Severide called her that to the hospital administrator in the bone marrow episode). Oops? And is her dad in Chicago? If not, people were doing a ton of driving back and forth. Some sloppy writing (though I still love the show).
I think the Squad 6 story could have been meaningful - the loss of nearly a whole squad with one member making it out in good shape - but they really should have introduced Squad 6 earlier in the season to help the viewers care more. As it stands, all they did was show up and hang out at the firehouse when Truck was away on a call...so yeah, it wasn't as effective as it could have been (but still triggered thought of how easily a whole squad could be wiped out)
Severide got a little taste of his own medicine, with Anna pushing him away when she needed help...that is what he always does when he is in distress. Severide showed some signs of growth, some emotional intimacy....well, at least he didn't go out and get plastered, anyway, upon getting the bad news. Interested to see where he goes from here, another terrible loss for his character. But his idea of 'we can fight' (from the preview for next week, and also by the fact that they went from the comfort of her dad's house to the hospital) is probably a mistake...im surprised they went to the hospital. With her outlook pretty grim, I wonder whether taking that camping trip may be a better use of time than getting admitted into a hospital
Eta:I wonder why only 22 episodes this season instead of 23