This makes sense, thanks. I was under the impression Ken was sent to Gouken because he was a stereotypical rich kid and his family thought he was a leech, but him already having some fighting experience would not be surprising. I also seem to recall Ken being described as having more natural talent than Ryu(which explains how he can still keep up with him despite having a family and job as opposed to Ryu who just trains and travels the world) so this would explain how he'd catch up to him quickly.
Interesting, so does this mean Ryu knew Goutetsu and trained with him? I always thought Goutetsu died before Gouken took Ryu in, with Akuma coming back some years later to challenge Gouken and Gouken defeating him but sparing his life. Then he comes back and kills Gouken and defeats Ken in like one blow when the latter fighter happens upon their confrontation as he returns from winning his own tournament. The lore seems convoluted around these parts, or maybe fanon has elevated misinformation.
I do agree that Goutetsu is cool but I can't see how adding him to the game would add anything to the story-- we basically know what his role in it was, and anything else could probably be given to one of the other Ansatsuken users with little difficulty.