One of the main roles that a hockey player knows is when to get aggressive at all times.
.... this has an issue - roles are generally played and therefore it sounds slightly awkward for me here. Also why you say at all times? ... I guess you better re-phrase this line
With hockey being an hard-hitting sport, it is safe to say that a physical and mental state of mind has to be on point at all times no matter what the situationis
father of 13-year-old Tyson's
father of 13-year old Tyson / 13- year old Tyson's fatherNot only is fighting in hockey very aggressive, it may also lead to many blind attacks on any individual on the ice at any given moment.
but also makes them thea "complete player"
You need to pay attention to grammar mistakes here