The issue with stego in Q drops that is all the images are too small to really store much data. It also doesn't fit with what's been going on here to expect to find some secret leak or something linking us to some off site file drop. I feel like if we are to find anything hidden in the images it will be a simple message like "Bring on the PAIN" or "WWG1WGA", where the message itself isn't so much the drop, but the method we used to find it is. It'll probably be something trolly that not only shows us how they communicated in plain sight, but also taunts them that Q team knows everything that they've said.