I don't think it's real.
I initially agree with you. My first I.pression was it and sort of believed it had merit, but more I look at it the more a couple things look off.. but i cant really put my finger on it.
Perhaps spatial - letters seem full/tall yet the sig might appear a bit compressed sideways. Others will know much more.
Yeah on the surface it looks pretty real .. no dead giveaways. If real, it's not a recent autograph.