And miraculously Japan and Germany was able to build new factories and refineries, aquire vast amounts of raw materials and rare alloys and also discover huge untapped oil reserves under Tokyo and Berlin?

And don't forget the UK who were not asleep behind the wheel at all as far as jets and advanced piston aircraft were concerned. They had several new models in prodution or in pre-production development (spare me the pure fantasy Luft'46 planes that never made it beyond drawings on the the weinerschnitzel stained Bierhaus napkins please) like the MB.5, Vampire, Swallow, and the Fury/SeaFury for three examples.
.U.S.-----------------------Germany ---- JAPAN
P51D/H,P-47M/N--------FW-190D------
P51H,P-72,P-47M/N----TA-152H -------
F-84,P-80,P-79----------Me-262 -------(Kikka)
P-80,P-79-----------------HO-229 -------
F-84,P-80,P-79-----------HE-162--------
P-72,P47M----------------DO-335--------(never had a DO-335 copy)
F8F,F4U-4,F7F-----------..............-------KI-84,A7M,N1K2
AD-1----------------------- ??? ---------- ????
Also, the USAAF and USN had these (or would have had the productions been halted or cancelled due to wars end)
(jet fighters)
F-84
FJ-1
F6U-1
FD-1
F2D-1
(fast & heavy bombers)
B-32
B-35
B-36
B-42
B-43
B-45
B-46
B-47
B-49
B-50