Did you know that Guile learned his Sonic Boom from Nash? Of course you did. But you didn't know that Guile had to use American scientists and the best technology to get it down, and it still takes most of his concentration to do it with both hands.
I thought Nash taught him that whole style period not just the Sonic Boom. But I expect Guile to be a beast in SFV, nothing like his SFIV counterpart.