Thats a nice theory.
I dont think Henry Gale would have gone himself to find Jacob though. I mean he does have cancer, and who knows if any pain associated with it. but i could care less about Henry Gale's pain. He is the leader bean of the group and i would assume he would send any number of his other cronies.
BUT i always think that he wanted to get cuaght and infiltrate the group. Since He knew he already had Walt. He knew that he would eventually be dealt back to his group.
PS..
oh and benos.... of all people... you should read this thread
Henry Gale til death...