With all due respect Shorin ryu is much older than what you are describing and I don't understand how you are saying in its present form. Kata that are taught today in the the Shorin Ryu schools are very old.
What I am saying that although Shorin styles have a long history and some of the kata have been around for a long time, all the famous teachers who we know for certain have a "named style" (can't come up with a better name), e.g. Chibana and all the various Shimabukuro, they all lived and taught around the mid-1900's. Before them, the teachings were not collected under one teacher. The "kata blends" of the various teachers haven't been around that long. Just as an example, let's take Zenryo Shimabukuro, as he is of most interest to me. His teacher was Chotoku Kyan. Kyan collected the various kata he knew from various teachers. Seisan and Gojushiho he got from Matsumura (or more likely from some of his students at Matsumura's dojo, as Matsumura was already an old man then), Wansu he learned from Maeda, Passai from Oyadomari, Chinto from Matsumora, Kusanku from Yara and Tokumine no kun from Tokumine. The last kata he learned (which if I remember correctly was Tokumine no kun) Kyan learned sometime in the 1920's. Ananku he created himself. Now we come back to Zenryo Shimabukuro. He added to those teachings his own creation Wanchin. His son Zenpo added even more kata which he learned from Nakaima: Pinan 1-5, Naihanchi 1-3, Jion and Passai Gwa. Then there are of course the Fukyugata and it is only after those that we have the complete "kata blend" of Seibukan.
This was my point. I am not denying that e.g. Chinto or Kusanku are old, but that the kata we practise today under various school names were collected into those schools much later and can we really talk about all the various styles before they have really been formed? Shorin and Shorei in general, maybe and even that classification is sometimes a bit odd, as there are kata which belong to both, like Seisan. Also the Shuri, Tomari and Nahate classification is, IMHO, a bit artificial. It does have it's use as a general classification guide, as the teachers in a particular area apparently did have some special kata that wasn't necessarily known in the other area.
Pinan kata are stil over 100 years old now.
Very likely yes. We don't know for certain when they were created.
Chotoku Kyan called his karate Shorin ryu and this was prior to WW2 because Kyan Sensei died in 1945.
Sorry, but here I disagree with you. Kyan called his karate karate, nothing else. As Itosu before him, Kyan thought that there are only two styles of karate, Shorin and Shorei and while he
may have said
if asked which he taught that he taught Shorin, he never named his style after it and he called it simply karate.
