If anything I might buy the argument that Jobs was a huge control freak and that's what drove him to do this more than anything else, but how do you think this went down.
Jobs really didn't like having his engineers poached because it disrupted continuity. So he said to himself ... what am I gonna do? what am I gonna do? Offer 2x whatever Google is offers? Noooo ... that would never work. I need to call up Google and threaten a poaching war?
I'll go with Occam's razor. The simplest explanation is the best.