What do you mean by hybrid style? If you go back to the early 1900s there were basically three styles of karate, Naha-te, Shuri-te and Tomari-te. These were all similar and the students often trained in more than one place. In terms of 'hybrid' they all combined the Okinawan Tegumi or wrestling with the style of Kung fu that had been brought back from the Fujian province in China. So yes, these systems all included grappling. Pangainoon (Uechi Ryu) was different in that Kanbun Uechi trained in China and then opened a school in China before returned to Okinawa with no intention of teaching his art there. When he did start teaching, it was the Chinese art he taught, not the same as the Okinawan 'hybrids'. So although Uechi Ryu contained the grappling elements, technically it is probably the purist form of karate as it was taught in Okinawa the same as it had been taught in China.
The karate that was taught in the schools and was in turn introduced to the schools and universities in Japan was a much simplified form of karate that in the main no longer contained the grappling elements. It emphasised the kicks and punches and morphed into more of a sport than its Okinawan root styles.
Now from the question above I might suggest that 'hybrid' is in fact being used as a synonym of 'complete'. If that is in fact what is meant then certainly Okinawan Goju is true to its roots, does contain all the grappling etc and has not evolved into a sporting style.
As to the most hybrid style of karate. Well I would have to nominate Wado Ryu. Hironori Otsuka merged Shindo Yoshin-ryu with Shotokan karate to form what is in fact very similar to the karate that was around in the first place.
If you step slightly outside of karate as such to find hybrids then systems like Krav Maga and Systema really are hybrids mixing karate with Boxing, Muay Thai, Aikido, BJJ, Judo etc. In a recent thread someone posted a video of Kajukenbo, something I had not seen before. It originated in Hawaii and the name reflects its roots. Karate, Jujutsu, Kenpo and Boxing. It also has elements of Escrima.
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