Sorry for your losses.
We have severe MF (low everything, but normal DNA fragmentation). I liked Dr. Shin alot, as did my DH, but even with our #s he said sperm wasn't an issue as long as you do ICSI. He was right. We had an issue with embryos arrested before blast, but it was the protocol - higher doses of stims, that seemed to be the problem.
40 for a man isn't usually an issue. A woman's age matters much more (annoyingly).