Having more than one project managers can have both advantages and disadvantages. I think the multiple Project Manager will cause chaos in the team as there could be possibilities in the opinions and functionalities. Due to presence of multiple Mangers there are chances of miscommunications and conflicts which may delay the project if one managers guide something and the other manager disagrees with the others opinion. Since different managers will different thinking, different personalities so execution of the project can become difficult. So, having more than one manager is not a benefit for the project to run in a smooth way.