Are your rewards systems and pay systems designed to reward innovation and inclusion, or single-mindedness and seclusion?
These are issues companies face every day. In an environment that awards singular effort, there may be others who contribute as much (if not more) than others. If the team is recognized, the morale increases, and similar projects succeed.
However, if one team member consistently takes credit for the hard work, and is rewarded for that work, this can lead to long-term morale decreases amongst those whose efforts are not recognized.
Next time you consider recognizing a member of your staff for their efforts, first look at everyone who was involved, and publicly thank and recognize all of those who may have been a part of the effort.