Originally posted by DarkSaint85
I still hold the opinion her best feat - mindphucking Xavier - was done because they shared a special bond etc
That's not her best feat. Her casually no-selling both Xavier and Jean combined and then easily taking them both out at the same time was even more impressive. And this was a Jean that had begun to manifest the Phoenix Force. I trust Cassie had no special bond with Jean (and Jean during this arc was portrayed as stronger than Xavier, able to hold all of Xavier's entire consciousness alongside her own for a time).
Going by feats, unless there's clear evidence demonstrating his resisting a telepath that was significantly stronger than Xavier and Jean put together, I'm inclined to side with Cassandra on a pure mental battle.