I wouldn’t like a “suction” aspect I don’t think. I generally like heroes with powers that have specific quirks or limitations.
Plus if he could “suction” all kinetic energy in some sort of radius (spheroid?), he could just make everything around him stop moving. Kinda drastically changes the method with which he’d utilize his powers.
I do think the ways in which he uses the energy he passively absorbs that does hit him that is ever-present (such as sunlight) could be better utilized though.