hand model questions?

[jiangwei221]

Thank you for your work!
In the picture you uploaded, I found that you have “pip first” and “pip second”, and this two joints share one DOF. I don’t understand why you made this design? I think if you have only one pip for each finger, the model should also work.
Another question is: according to my search on the Internet, MCP should be a 3 DOF joint, is there a misplace of the MCP and finger base in the picture?
Thanks!