At the youth/beginner level, I see the opposite issue - front elbow staying down by the belly button - symptom/cause/effect of the all-too-common DBSF swing.
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Yep. I've seen lots of that, too. The upper part of the front arm pinned to the torso is a swing-killer.
Descriptions I like for the elbows...
"Front elbow works up to the level of the pitch"
"Rear elbow works down and under the hands...but not in front of the hands"