Why do you think Froch has improved?

There's no doubt thatFroch has fough one of the hardest ongoing streaks in the game, but I fail to see these drastic improvements that everybody keeps on mentioning. Froch is still a hitable man, no improvements in his defence, which is still low and high reliant on reflexes. Last time kessler punished him to the body, and did not get lured into the cobras counterpunching game. Yes, against Bute he looked like hulk, but come on now, do we really know anything about Bute other than he was undefeated good looking champion? What if he can't handle pressure fighters with heavy hands? Froch is not the fastest puncher but still managed to hit Bute at will after the first couple of rounds. I don't believe for a second that these bullrushes he did on Bute will work on Kessler. So what departments do you thinkfroch has improved and why do you see it.