Note: If you want a better story, read Froggy's Eleanor series (which I am a massive fan of). That is all. And thank you for the praise.

Mech and Power Armor Distinction: You are correct in stating that the mech is piloted and that power armor is worn. The suits in this are a hybrid of both, since they depend on the wearer's abilities to function, and has a cockpit (piloting), while at the same time, it augments the wearer's abilities, similar to a suit of power armor.

XC-091: You will see the XC-091 do A LOT of damage soon enough.