It’s hard to say without evaluating the integration in entirety. However, I agree with Marco, I would not bring in a new team unless it’s very bad. I would bring the current team together to reassess the timeline and goals and walk away with an action plan to get it back on track. Also, I would be sure to communicate challenges and any potential changes in dates or outcomes with appropriate parties. I would consider a new leader of the project before I would change the team mid-stages.