There was too much info flying around from multiple sources just on this issue alone among all the other info flying around on the night of the Iowa caucus. Trying to collate that influx of data in real time results in the "fog of war" where things become purely reactionary until the fog clears.
Carson's camp (I'm looking right at you, Armstrong Williams) shot itself in both feet and both hands with atrociously poor communications control. It was so bad that one could almost think it was a lame - very lame - attempt at a PsyOps action by the Carson camp. This was where it all started.
Both RUBIO and CRUZ ran with the info based solely on news reports without any due-diligence, most likely because time was of the essence during the midst of an active caucus. Both camps were wrong.
Both RUBIO and CRUZ should have tasked someone (or two or three) to *immediately* verify the info with Carson's campaign leadership. But they didn't. They stayed on social media with it and just added to the whirlwind of tweets & posts swirling about. Again, both camps were wrong.
Carson's camp should have tasked someone with contacting the leadership of all other campaigns & major media to clarify and correct the bad info they spawned as soon as they became aware it was spinning out of their control. But they didn't. They stayed on social media with it and just added to the whirlwind of tweets & posts swirling about. It may not have been solely their responsibility, but it was absolutely, most definitely, purely in their better interests to do so in an organized manner that left no doubt they were taking control of the messaging.
What I DO NOT believe happened was that either the major media, Rubio or Cruz staff looked at Carson's tweet and thought to themselves: "... Hey! Everyone look at this quickly!! Carson's camp just tweeted something that clearly indicates he's staying in the race so we should instead tell everyone he's dropping out! Great idea, right?!..." I think it would take a high degree of intellectual dishonesty to think that any campaign would knowingly do something like that -- something that they knew full well would so easily backfire.
Rather, they took Carson's message at it's word and responded accordingly. They had reason to think Carson was leaving the campaign because Carson's campaign initially led them to think so. After that, there was so much follow on traffic flying around from so many different sources, it was like trying to pick one shouting voice out of a convention hall packed with shouting voices.
Hopefully, everyone involved learned something. I doubt it. Opinions may vary...