The game is very clearly not made for a second playable character. Case in point, the Aviator boss fight for Ray, wherein she is frequently and repeatedly referred to as “Beck” because that voice-line wasn’t removed or altered.
Also, Ray’s Countershade ReXelection is ASTONISHINGLY useless, what the hell.
Since I screwed up and didn’t schedule PART 18 properly, I’m pushing PARTs 16 and 17 now.