If I'm not mistaken, the FW-190C prototype (V13) with the DB 603A was flying in mid-1942 and the D-0 with the
Jumo 213A was flying in October, 1942. 1942!
A precious year goes by....
On May 25th, 1943, Galland issues this memo and several days later Milch orders the Me-262 into series production.
BUT, Milch and everyone else ignores the more immediate issue of canceling the Me-209 in favor of the Jumo/DB powered 190's.
Over a freakin' year goes by and finally the D-9 is ordered into series production...
But by then it's too late, way too late... I'm utterly amazed by this sequence of events.
Actually as the further you get into German aircraft and their histories, you'll find that this type of 'event' was fairly common. So much wasted on useless designs, politics playing their hand and of course Herr Hitler's wild fantasies.