Haven't you seen pro bodybuilders with weak or lagging body parts.
These guy take massive amounts of various drugs, dedicate their entire lives to training, eating and resting.
And still can't get certain body parts to grow to be in proportion.
Then some will resort to injecting oil to compensate.
Ruhls triceps, johnny jacksons calves, big dan hills every body part.
By all means hit those delts from 50 different angles with magical exercises.
To be fair,,both JOJ's quads AND calves looked better when he first turned Pro, from what I remember.