First, those look like speckles/freckles, etc. to me. Not a vet or expert on scale rot, but I've seen pictures, and it looks nasty and generally covers an area, not distinct spots, from what I've seen.
I'll let others chime in here on the above, but some morphs tend to get these speckles/freckles more than others. They look almost exactly like the speckling my BI's get, especially my VPI T+ Sunglow.
Secondly, he will shed when he's ready.
Finally, if he's healthy and happy, do not worry about his weight versus other BP's. They all grow at their own pace.
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