My question was clear and directed to one individual. You somehow redirected to the whole community and tell them to prove me wrong. No I as asked to substantiate the claim (and in this case screenshot is clearly the right and robust way to do it).
In that specific case yes. Players request information about the criteria for the minimum activity to earn star. Wiki , v-log and developers are not sharing any information, consequently it is up to the willing community to find out. There is still the possibility to ignore it and carry on playing without worrying about it. Fine by me. Unfortunately some players made claims on the actual criteria leading to fantasist theories and more complaints.
Is there a way to give a reasonable idea of the actual criteria (current value, those may of course be subject to change from one event to another)? Yes! Screenshots of actual battles displaying scores, kills and stars rewards. If we don't do this research work, you end up with mere gossip and myth, and still play with this pending uncertainty in the back of your head.
Making screenshots and loading them as an individual is pain taking but as a community the task is easier. A group is more powerful than an individual. Plus we can all benefit from the work of the others and build knowledge and more reliable data.
On other case screenshots will not suffice, a video or a full topic to gather data (such as the container prob project) would be more appropriate. In other case we will never know for sure and heated debate and exchange of opinion will persevere.
As a general recommendation, screenshot speaks a thousand words and are better than a text wall, so overuse them.
[The request has nothing to do with the contest of how you end up in the battle in the first place, so I will ignore comment about it.]