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It makes sense and, as you say, fits the examples I found. Finding perfect comps would not likely seem to say anything in regard to SLG since it would include the AAA to MLB jump to make anything really inconclusive.
I think it would also depend on their starting weight and where they added it. Someone starting at 165 adding 20 lbs to their upper body seems different than 215+20 with a full body regimen.