When watching any NBA game you might be impressed by the rounded delt's of a lot of the players. Also gymnast included.
Rounds delts depend on muscle insertions, heretic factors dictate this. As some are born with high/flat biceps, high/low calf's, high/low lats, etc. Can always improve any muscle, to it's best potential but not it's placement or shape. Might have 20" guns, but a flat bicep without any noticeable peak at all. Can never re-shape a muscle, unless surgery is applied (maybe).
Seen a few top BB'ers & Pro's with lop sided delts, arms, pec's, etc which would suggest a oil spill inside and under the muscle. Or who ever applied the needle did a very bad job. Good luck.