I don't know anything about Mr. Timmerman, his experience or his skills. But from checking out the school's website and YouTube, I think you may be on the wrong track if you want to evaluate your training based on "lineage".
Confirming an instructor's lineage can be a worthwhile endeavor if you want to check that
- An instructor has training in the art(s) that they purport to teach and
- Their capacity to teach said art(s) is attested to by some other recognized figure in that art's lineage.
For example, if Mr. Timmerman claimed to teach Toshindo, then it might be useful to check whether he had trained with Stephen Hayes and had been awarded teaching credentials in that art.
If Mr. Timmerman claimed to teach Sanuces Ryu Jujutsu, then it might be useful to check whether he had trained with Moses Powell and had been awarded teaching credentials in that art.
If Mr. Timmerman claimed to teach Motobu-ha Shito-ryu, then it might be useful to check whether he had trained with Shōgō Kuniba and had been awarded teaching credentials in that art.
But from what I can tell from the school website and YouTube channel, he doesn't. Corpus Christi Family Martial Arts purports to teach "martial arts" (unspecified) and "Karate" (once again, the specific type is unspecified). From what I can see in the videos, the Karate being taught is some sort of generic home-brew system. I expect that having created his own homebrew system is Mr. Timmerman's basis for promoting himself as "Grand Master." This system doesn't have any particular resemblance to Motobu-ha Shito Ryu. I definitely don't see any influence from Toshindo or Sanuces Ryu.
From what I can see online, the school does not present itself as part of any specific historical lineage. They promote themselves as a fun, welcoming place for kids and adults to get in shape, learn some self-defense, and develop discipline, respect, and all the other buzzwords used as marketing for parents who are looking for an after-school activity for their children.
If you want to make informed decisions regarding your training, I would look at whether that is what you want in an academy and whether the school delivers on that promise.
BTW, it's entirely possible that Mr. Timmerman has indeed "trained with" all the names on that list in the sense that he has attended classes or seminars that they taught. In my 44 years of training I have attended classes and seminars with a long list of prominent instructors. (Much, much longer than the list attributed to Mr. Timmerman.) That doesn't mean I was ever a regular student of those instructors or that they awarded me any ranks or that I am qualified to teach all the arts that they represented. If Mr. Timmerman claims that he studied "directly" under the teachers he lists, that means ... well not much honestly. It's not a term that has a really specific meaning. It could mean that he went to a seminar or visited their school for a couple of weeks or took a private lesson.
If Mr. Timmerman claims that he was awarded certain ranks by those individuals ... it's probably not that relevant to your training at his school. Even if he was awarded a rank in those arts, it doesn't seem to be part of the curriculum being taught. If he claims a rank that he was not in fact awarded, that would speak to his integrity as a person and it might affect your opinion of him as a person. But since he doesn't seem to be teaching those arts, it shouldn't affect your training.
I should also note that MartialTalk has a policy against fraudbusting. So if Mr. Timmerman in fact is claiming, for example, to have a certain rank in Toshindo that he does not have, site guidelines do not allow posters to be explicitly calling him out for that. But I doubt anyone here has specific knowledge of his qualifications in that regard. (If someone does have specific knowledge that he is claiming particular ranks that he does not have, they can send it to the original poster as a direct message rather then posting it publicly.)
