The only thing that for me ken is missing, actually, he needs to get rid, is his hadouken...
I mean, i know shotos are supposed to have fireballs, but think for a second, he already have this super rushdown moveset, including a run. So why not get rid of the hadouken.
"But Sotherius, he is a shoto character, he needs a hadouken", Well, Gouken is a shoto master, and he doesn't have a shoryuken besides his super and ultra (so, he is to powerful with the shoryuken that he doesn't have normal ones anymore).
Think that Ken, when he reached his apex, wouldn't have his fireball anymore, because it was useless to the style that he developed.
But i mean, he is cool the way he is, he is unique and a shoto at the same time, and that means that if Akuma appears, he will be way different too, Sakura, well, she is already different, just give her a divekick and she is set. =P
I mean, if we consider that Akuma pursue the purest form of ansatsuken, his moveset would be the original. Gouken, searched for another ways to evolve his fighting style and as a master encourajed both Ryu and Ken to do the same, and i think would be cool, the older ryu and ken gets, the more different from the classic shoto we have their fighting styles reach.