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Of course a woman can be dominant in sex, but it's a matter of personality. Does it seem to you that someone with the personality of DG can have the role of the top in a gay (or even a straight) relationship? If dg were straight he would still be the submissive one of the couple, because this is his nature/personality it's not about the gender...
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Well DG has never experienced anything other than being a rather passive bottom. He's never tried topping, he's never even received head. So he might like it if Jiwon was a bit more open minded to try and bottom himself,
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He might, but it's not out of the norm to not want to top. Even in his fantasies before he met Jiwon, he was the bottom. BL genres tend to keep things to a formula, so it's likely DG will never put it in Jiwon. At least, he'll ride him. As for head, I feel like the author was being a bit of a tease with the rimjob, I mean why is she pulling back on getting DG head? Jiwon gives DG handjobs all the time, so he knows DG has a dick. Does the author think that giving head is submissive (but giving a rimjob somehow is not)? And again, I don't think there's anything wrong with being submissive or passive, as long as both parties are into it.
I hope DG asks to top ლ(´ڡ`ლ)