User blog comment:Rvb forever/Is Uncle a Van der Linde Gang Member in RDR?/@comment-9615725-20180627154815

It's likely the Bureau knew that Uncle worked for John, and since they were going to kill John anyway, I don't think it's that farfetched to think they planned to kill both during the assault. Even if Uncle wasn't there, it wouldn't be hard to find an ancient drunk barely able to aim.