Reading the article I got curious about how come the construction "had rather X" came into English and studied it through OED. What I learned is as follows;
1) In English there are many similar expressions. They can be all represented by a construct: had adv X or V Here A : 'as good', 'as well
The link above does not work and it does not redirect you to the explantaion...' I have the same question although I beleive "had rather" is what it should be accroding to English book.