Leaders / lead developers, experience, whitepapers should be original and you have to be careful reading it.
There are found whitepapers that are being copied from other projects.
Yes, whitepapers have been plagiarized and additionally, websites have been flat out copied or are incredibly vague--so don't overlook an ICO's website. In terms of the community aspect, one sign that is usually positive is if the ICO's team is active on their telegram group. If they are openly and regularly answering questions it is usually a sign that the team is truthful and motivated.
We are not sure if the person who is active with their telegram group is really a part of their team because they can just hire someone and educate it to answer to the questions of their potential customers/investors.
But that's still a good sign that they are very active conversing with people who are interested with their project just to give clearer idea and answer questions accordingly.