Whether the price of the coin or token will dump after teams allocation is released I did say depends on how the team handle the project or how successfull or far the project have become of gone before the release, if the project is poorly managed and the price of the coin or token is struggling to stay up, and team allocation gets released, if the team decides to sell in this kind of situation, I believe the chances of the price going down is high.
But if the project is already super successful, then theres nothing to worry about as the team selling their allocation won't even have an impact on the Market.