I might be making this too soon because I haven't played the game and know little about it but I was just so surprised to see one boss fight in particular where Sekiro blocks repeated giant sword swings from a massive kaiju sized dragon and also leaps into the air to catch lightning bolts from the sky and throw them at the dragon. He's crazy powerful it seems.
@reddsevil34: I try to make less predictable battles with less similar opponents. The Scotsman is a more interesting opponent for Sekiro who was Jack's equal even though their fighting styles were different so I chose him over Jack. Sekiro and the Scotsman still have their prosthetic limbs in common, though.