One of our members knows one Kendoka who learned Kendo "few decades" ago but has stopped for a long time. He asked me why the Kendoka seems to have different styles from what we are doing. Actually, I think that there are no much difference but just evolved to a "finer" way.
Some core concepts such as Sen, Seme, Sutemi and fighting for central line etc are still the very important concepts today.
Anyway, it is really a pleasure to watch the video clip of The 1st All Japan Kendo Championship in 1952:
Hope you will get some inspiration from these great senseis.