Suggested by Sonic Cassidy’s actually gotten some reasonable power ups over the years including size manipulation and the ability to control plants. I wouldn’t have really expected that of him. Still, he’s absolutely no match for Bastion. Bastion has a very high level of durability and attack power at his disposal. He can very quickly overwhelm Cassidy in a 1 on 1 fight and just wins in every category that counts. Bastion (Xmen) wins.