How do you politely handle a very new data scientist with a PhD

That constantly disrupts experienced members of the team. For example the other day they butt heads with the team lead because they had read about a more accurate way to solve our optimization problem but the constraints would have made it extremely time consuming to solve this way.

When questioned in a private meeting they tried to degrade the educational credentials of our team lead (bachelors degree with 15 years experience in this exact problem) which I thought was inappropriate.

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