The R & D arm of suzuki was twofold. both designing thier own models and sharing nothing between them , pity. Can often see early prototype suzukis on the net and they look entirely different designs.
In the late 60's trail bikes were all the rage so suzuki made a trail version and called it the TS and it was based on one arm of the R & D departments works racers which the TM were also based on. Not a bad strategy for sales and competition.
Meanwhile the other arm of suzuki R & D went on plodding away designing what would become the RM series.