If you mean a cockpit with no commonality between the rest of the Boeing fleet when you wrote "orphan", I believe that it might not be completely true. The 787 and 777 are operated as a single fleet by several operators. It's safe to assume Boeing would design the 797 to have a common cockpit with the 787, the current and future 777. I think (and hope for Boeing and Boeing pilots) that the 737 is and will be the only "orphan" left in their line up.