In the legends, Sun Wukong had the ability to transform. He could easily take the form of any living creatures and could even imitate their abilities.
Given Feng Lin's understanding and knowledge toward genetic theories, he could be sure that once he awakened the Sun Wukong Gene, he would surely obtain the ability of the countless transformations. This wasn't just a fantasy, but he didn't know anything definite about it.
If he could really transform into anything he wanted to and use all kinds of abilities, wouldn't that simply be too domineering?
Every type of mythological ability was different. The ways to use them were different as well.
If the Kunlun Grand Palm Imprint could be incorporated with the various abilities of genetic martial arts or be used in sync with the ability of countless transformations, that would simply be a perfect match and he would be successful in every endeavor.