So the ability to make all things possible manifest is not omnipotence, it takes all things possible and impossible?
If we confine ourselves to chess, a knight must move in an L shape, two in one direction and one in the perpendicular direction. Chess does not imply that "actual" knights need to move in that way. "True" knights like Luke Skywalker are not limited to moving in an L shape.
By analogy, most of the time, we are confining ourselves to Aristotle's logic. In that logic, omnipotence can't exist for if nothing is impossible then it is impossible that the statement "nothing is impossible" is false. Or, if you prefer, omnipotence can't exist because it would entail that nothing is impossible.
A "truly" omnipotent being, like a "true" knight, is not limited to Aristotelian logic, and its nature is no more dictated by logic than Luke Skywalker's nature is dictated by chess.
"Be as wise as a serpent and as innocent as a dove."