Re: Odd question about external rotation.
Doesn't matter.
Scapular retraction is not a requirement for working (mostly) the infraspinatus with the arm abducted 90 degrees. Arm next to side works teres minor a bit more than infraspinatus.
Although if your horizontal pulling is weak it may be a good idea to work scapular retraction separately through any type of rowing (except upright rows)
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