Multiple groups on the same course...

I wanted to start a discussion about multiple groups on the same course and the best way to deal with it... I know we have to have it with all the racers these days, but what is the best, safest way to handle certain situations - like at the finish?
I was in the Cat 3 mens race at Snelling. There was a break of about 14 guys up the road and I was in the main chase pack. As our group turned the final corner to finish the race there were two solo riders from other groups slowly riding down the center of the finish stretch we were going to be spinting on.... Some would say, why are you guys even sprinting for 15th place? I guess that's racing.... regardless, we passed the first rider chaoticly but safely... the second we started to pass inside 200m to go with guys going on both sides of this slow riding person.... That person was, I think, surprised by the group and from what I heard moved quickly to one side where I ended up in the wrong place and on the ground with a broken bike....
I also heard that our case wasn't the only one on the day....
Should officials give out "overtaking rules"? Should an official manage small slow groups, pulling them to the side within the last 1k if in danger of being overtaken?
Curious of the thoughts out there...

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