Quite the opposite! On the 1st May 1939, Reg Bryant produced a drawing for a motorcycle that can rightly be considered to be a T35 prototype in that it had a transverse engine in a frame very similar to the proposed solid frame T35 that eventually got shelved. This engine had heads and barrels almost identical to the generator engines. Now, the generator engines were produced in the early 40's, so Reg Bryant's motorcycle engine spawned the generator engine - not the other way round (as legend would have us believe). I am convinced that the Reg Bryant bike did actually exist - I have had a good look at a pair of Douglas crankcases that match it perfectly - and they are stamped up '1' (the first prototype??). Also, quite a number of detail drawings for that machine still exist. The discolouration of the inside of the cases show that it had run for a considerable time!
As they say "The plot thickens!!"