"There is Severus Snape, although I would imagine Meg would have had reason to resurrect him. I am not certain of their exact relationship, but they were associates in some form or another. Her actions towards him at least made sense, though I am relieved that she also saw it fit to assist you."
At least for the time being. Cas understood that friends were far and few between. He was far less naive and far less trusting than he would have been as an angel, and found himself prone to examining everyone he met closely. Ever since he'd encountered hunters who wished to seek revenge upon him simply for being an angel and therefore associated with the Apocalypse, he was constantly wary. Steve however, showed no signs of hostility unless provoked, in which case, Cas was willing to overlook.
"We...should put out a message. Asking those who were healed to come forth," he said. "We will then ask them if they have been experiencing any side effects if there are any to behold."
Beyond that, Cas hadn't thought very far. In his mind, there was no reason to. It was not an alarming concept so much as it was something the group needed to be aware of. After all, Meg was prone to being unpredictable. It only made sense to be aware.