"Or perhaps there is an adult brother who is restricted from conducting the meeting or offering congregation prayer for reasons known by the elders. Without revealing confidential information, the elders should let the assigned sisters know that they should conduct and pray even if he is in attendance."
So Chester cannot conduct the field service meeting. No one knows why. It's enough to know that he 'just can't'.
When the car groups are organized Chester can work with Becky. Chester likes working with Becky. No one said anything about Chester not working with Becky. Just that he could not conduct the field service arrangement. So Chester asks Sis Conductor, ' Can I work with Becky'? 'Sure' says Sis Conductor. That phone call didn't say anything about working with Becky. Just not to let Chester conduct the field service arrangement. I'm sure they would have told me if he shouldn't work with Becky. 'Of course Chester, you can work with Becky. Maybe she can go in your car. Why don't you take her to some of your return visits? Why not go alone with Becky?'