Bombshell is already confirmed to be safe, look at the last preview page. We see her, Power Man, Pinpoint, Nova, and Ironheart. So none of them were caught in the explosion. I do suspect that Kamala and Viv were (it's at Kamala's school and we know something happened to Viv), and are both hurt badly, and that Viv gets the blame. I wonder if this has to do with Sparky? Zub never resolved the Ultron infection plot.
Locust and Snowguard don't need killing to be written out. They're Mexican and Canadian, and thus could just be deported (if they relaunch Alpha Flight any time soon, it could set up Amka joining them).