PC-CRASH Multi-body option IS the ATB program!

[MSI]

Quick comparison of the ATB program vs pc-crash Multi-body simulation
first note that ATB is:

ATB general purpose lumped mass program.png (29.78 KiB) Viewed 100 times

And here is a comparison of the models, look familiar?

ATB v pc-crash multibody.png (187.43 KiB) Viewed 100 times

And here are the ONLY references pc-crash provides about their multi-body option:

pc-crash multi body references.png (32.94 KiB) Viewed 100 times

why?