Can I comb straight through my hair with 'any' of the horn combs, and can I massage with 'any' and rub scalp like you say with 'any of the horncombs as well?

Absolutely! Yes. no restrictions when we categorize... just different options;-) You are expected to use the finer as scritchers regardless of hair's thickness, but you'd use a no other type to pull through, that is a fine hair option, but pulling a scritcher thru is not mandatory.