I think there is lots of evidence to show that Big Jim's plane was copied from coast to coast.
Jim was responsible for the following:
1. He was father of the modern stunt design. His designs, which go back to 1970, were the basis for the high aspect ratio/large tail stunters of the 1970's. Very little has changed since. I do not think most even know where there own designs came from. Big Jim was visited by Al Rabe and Ted Fancher back in the 1970's. You might see some commonality there between what those designers produced in later years and what Jim was doing.
2. He was responsible for pushing bullet proof control systems. Something that is common place now.
3. He truly understood the stunt run. He has the "Big Jim" formula for compression and venturi that he applied to several style of engines. the Chinese beat our butts for years flying Big Jim based engines. The modern Doublestars and Retros are based on Big Jim style engines.
4. Big Jim did not "guess" he engineered.
From the online biography of Jimmy Casale written by Bob Hunt:
"Hailing from Paterson, New Jersey, Jimmy started flying in 1975 with friends Lou Dudka, Bill
Simons and Bob Hunt. His first contest was in June 1976. His first Nationals (Nats) was in
1978 in Lake Charles, Louisiana finishing 19th place with an early version of his Spectrum series.
This plane had the typical East Coast futuristic look along with a foam wing and a ST-46 engine.
Later he was to use the ST-40, the Max 45 FSR and the ST-60 engines."
Casale STARTED flying when that Big Jim picture was taken in 1975 with his 4 year old PM. Notice Bob Hunt called the PM look "typical". This look was indeed copied all over the world.
Brett likes to say stunt airplane design is “in the noise” and that we are arguing small differences like they are significant. I tend to agree.
The way I see it, the median point for the “noise” for the 1960’s was a Nobler or Ares (large thin wing, LOW AR wing, small 18%ish tails, short tail moments, small engines, low power, etc).
The center of the “noise” shifted in the early 1970’s to something totally different (high aspect ratio wings, fat airfoils, huge 25% plus tails, long tail moments, large engines, high power, etc). The source was somewhere in New Jersey, and even as Bob Hunt said these new “foam clones” propagated across the world. Take a look at the Genesis in 1978, it looks like a thin airfoil PM.
In no small part, it has not really shifted much from there still to this day.
I think the PM (designed in 1971?) shifted the new center point of the noise, and it was just the beginning of a whole new type of approach (it was not the end, even to Jim) that led to tons of new designs from Simons, Hunt, Casale, etc that looked very similar. You are talking about the “noise” as far as any significant changes that have been made since. You can take a PM side view and lay it over a TP plan. The only difference would be that the TP has a smaller root chord, and a larger stab chord. All the other numbers are the same within fractions of an inch (nose moment, tail moment, total tail %, flap %, etc). The TP has a smaller wing, which I agree with. I told Jim the PM was too big for my car, he said “get a bigger car”. Typical Jim!!!
Look at the PM compared to the 1978 Genesis:

