If a project manager adds a member to his/her project and assigns that member to tasks without going through the process of requesting that resource from the resource manager, will those hours that the project manager assigned to that resource appear under the resource's name in the Team Manager tab under the Resource Assignments section at the bottom?  This section indicates that it shows Hours Available versus Assigned but it appears to only show those hours that have been requested, approved and then assigned instead of including ALL assigned hours. 

The scheduled hours will show up in the Team Manager and also under the Resource Utilization view in the Resource tab of the project. I have been working with many people to complete the resource management loop without requesting resource.  To accomplish this, you can build your team from the enterprise, create your project schedule and assign the resources.  Once complete, look at the Resource Utilization view or look at Team Manager for Scheduled hours.  Add up the hours for each resource type (a report is perfect for this need) and request those hours for the role.  This way, you will see the planned hours and the Capacity Planner will work.