for the question about how to hotspot without flat spotting.
easiest explaination...ever try doing a burnout? the wheels are spinning, and the slippage of the rubber over the pavement increases temperatures more than a rolling tire, and overheats the tires.
sliding, as in drifting, will also hotspot the tires without flatspotting them, unless it is an ebrake initiated drift, then there might be minimal flatspotting...but that is over complicating this
flatspotting is an uneven wear on tire tread from a locked tire sliding across the pavement, which shaves that spot of the tire flat, and causes the tire to not be round any longer.
hotspotting is basically an overheated tire. it can happen in a specific spot of the tire, or across the whole tire. what could cause it to happen in one spot and not another?
tire pressure for one. all things being equal, an over inflated tires will hotspot in the center because the tread surface has become convex and the edges of the tire have less contact with the pavement, which causes them to experience less friction, and heat less. the opposite is true for under inflated tires.
another setup issue that can cause hotspotting on a tire edge is camber. basically the same concept as tire inflation, but the camber affects the left/right tilt of the tire and can excessive camber can cause one of the tire edges to be lifted off the ground.
hotspotting typically accompanies flatspotting, but the reverse is not necessarily true...and if a flatspotted tire is allowed to cool, it will still be flatspotted but not hotspotted. so it is very much possible to have one without the other.
images exagerated to illustrate point.