The events surrounding this change of leadership are not entirely clear .
It is speculated for the most part that his father had planned to name the second son , Takeda Nobushige , as his heir instead of Shingen .
The events surrounding this change of leadership are not entirely clear , but it is speculated for the most part that his father had planned to name the second son , Takeda Nobushige , as his heir instead of Shingen .