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I definitely don't foresee any major size advantage for JDM, at least not meaningfully so.
They've both fought in California and CSAC publishes fight night weights:
- Islam was 178lbs at UFC 311 in the cage.
- Jack was 189lbs at UFC 270 in the cage.
Both guys are bone dry when they weigh in with visible abs throughout. So you're looking at ~11lbs difference in lean body mass. That is a very big gap in combat sports.