Re: Me 410: "on a knife's edge"
 

I believe it is in Dr. Mankau's detailed history of the Ar.240, as published in Flugzeug magazine, and possibly elsewhere. I understand that Thierfelder was also a member of the comparative evaluation team at Rechlin in late 1942, where the Me.410, the He.219, the Ju.88G and the Ar.440 were judged: the resulting report (January 1943)being quoted as to the advantage of the Ar.440.

As for the presence of Bf.110 in day fighter units in 1943 - given that the Me.410 only began mass deliveries at the start of 1943, this is hardly surprising, but says little about the production intentions in the same period.

Re: Me 410: "on a knife's edge"
 

Graham:

As for me, I was wonder, what was the reason for Thierfelder's transfer from Eastern Front (I./ZG26 and later II./ZG2) to Africa (III./ZG26). VVERY uncommon transfer in Zerstorerwaffe.

Now, with Your additions, I know:
He went from II./ZG2 to Rechlin in late 1942, and then appointed to III./ZG26 in 1943.
THX for info.