Well, yes!
I'm not the one who said that it was Mok Gar. The person who identified it as Mok Gar is the one that needs to explain how and why he came to that conclusion.
If it's as hard to compare similarities as you say, then how did someone come up with the idea that it was Mok Gar in the first place?
We're not really talking about ancient history here. We're talking about a person (Lefiti) who was alive and teaching only 40 years ago. So if he really created his Splashing Hands out of Mok Gar it should be easy to verify.
Pragmatism is one thing.
But there is also the question of integrity and honesty here. You see, when the origin of Splashing Hands and its existence as a style is being questioned, by extension that means that the honesty of either James McNeil or Tiny Lefiti is also being questioned.
I'm not saying you are wrong. It may be that you are quite right that Splashing Hands never existed. But what I am trying to say is that the answer to the question is important for some people because of the honesty issue.
Consider that people represent things as they understand them. In the Ed Parker Kenpo lineage(s) you can talk to 10 of his first generation students on almost any topic and get 10 different answers. None of them are necessarily wrong or dishonest, but are expressing views as they understand what was presented to them through the filters of their own experiences.
Having been in the arts just over 50 years has led me to a point where much of what people have to say about their history is irrelevant. It doesn't take long to determine the validity of their background and the efficacy of their ability.
Bruce Lee was essentially a legitimate couple years student having began his training at 15/16 and arrived in America in the Pacific Northwest at the are of 19 as his own master. Not being knowledgeble, but physically gifted, he continued to learn from everyone he came in contact with. At the tender age of 24 he was giving demos and wowing the traditionalist at Parker's 1st tournament, and few challenged his capabilities. On paper, Lee should have been a bust. In reality he was impressive if not yet knowledgeable.
My point is in the combat arts, honesty is determined by skill and knowledge, not by certificates or lineages. I know people with legitimate exposure to Ed Parker teaching, with genuine rank certificates, and on paper are "honest" to their lineage. In reality, they are awful as martial artists. Unless you're entering into a business contract, I'd take the "honesty" a person shows me on the training floor over "honesty" on the wall any day. Its the nature of the arts. If "paper honesty" is your only barometer, you might miss some really good opportunities to expand on your only knowldge and ability.
There is no such thing as pure ... when pure knuckles meet pure flesh, that's as pure as it gets. - Ed Parker
Notice he didn't mention the name of a style or its origin. Life's short - study and train while you can, argue about names and their origin later. But then, that's an old man perspective. If you want to be a history student of the arts, just do that and leave the fighting to the "pure." That was Sifu's perspective and so it was Ed Parker's. Perhaps that is the true origin of what you seek. It didn't matter as much to those who came before you, as it does to you. Maybe you should take their lead.
"That's my take, but then I could be wrong." - Dennis Miller