Re: Bryan Singer Directing X-Men: Days of Future Past - Part 2
My guess is this.
FC was already in the making by the time X4 rumors were going around. X4 was originally intended to be DOFP,possibly without FC in mind. During FC, Brian found away of using FC with DOFP.
I still dont get why people insist on calling a non X3 follow up X4. That time is done.