Warpath original power was just superstrength and endurance, the same power as his brother.
All these additional powers of flight and heightened senses were just added by later writers to make him more powerful.
It's the same with Doug's additional power of body-language and ability to detect weak architectural points but were sadly ignored by Hickman obviously.
Magma flying makes more sense than Warpath because the mechanics work the same way as the Human Torch. Hot air is lighter, he is able to fly by providing thrust behind himself with his own flame.
Both Sunspot and Warpath shouldn't be able to fly based on physics. Storm flew using her winds, Angel flew with her wings... Hulk can only jump.