Of course. Whitepaper is only their documentation. It is only documents that describles the project and answers the following:

• What does the project do?
• What particular problem/s it really solves? (Why are they doing it?)
• How will they solve the problem?
• What are the target dates for the accomplishment of every parts of the project?
• Who are the people involved in this project?

It rarely answers these:

• How feasible is the project proposal?
• What are the methodology/ies you're using or the algorithm/s derived in solving the problem?

It never answers these:

• Are the people/part of the project really reputable, reliable and relevant on the project that they're doing?
• Are they doing things the right way?
• Are they doing things legally?
• Are they well funded?
• Are they well supported by their own community?

Whitepaper is just the tip of the iceberg.