Reeve obviously was starting to see the light at this point. His original purpose was to use the party to help accomplish Shin Ra's goals. When he realized that there were lives at stake, he started to slowly change his mind and wake up to the truths. The whole point WAS that it was disposable body. He could help the party without having to put anyone in danger. Otherwise, someone non-replacable would've had to stay in there and be killed.