I would need to see a video of the play before saying anything, but biting at the neck does not necessarily mean aggressive. Jackson can play very rough if the right dog comes along, and it may look bad to others, but it really is just play.
Also, god NO to the alpha rolling.
Here is a video of puppy Jackson and my moms adult dog (RIP). They used to play like this constantly. Very normal.
Wrestling doesn't bother me at all if both dogs are enjoying it. It's a very normal part of being a dog.