Like all of you said, JG would be easy to get go Know, since he’s so very outgoing and comes off as approachable and easy to get along with. But I think it’s be difficult to hold his attention for very long, since to me he seems to be a social butterfly whose attention is captured by this, then that and he moves accordingly. That’s not to say that he’d just leave you standing or ignore you, he’d simply move on and come back eventually, once his focus shifts back to you.
With John… he’s more difficult to grasp, isn’t he? I believe you’d have to invest a bit of time and effort to get to know him, and accept some or a lot of awkwardness in the beginning, be it from him and/or yourself. But gradually you’d find an in, something you might have in common or something he’s interested in you’d want to learn about and vice versa - I feel like humour is the key to his heart, but perhaps that’s just me? - and from there it’ll evolve into him seeking you out just to have a bit of your time and you adapting to his fast paced life to find some moments to spend with him.
I purposefully left out the sexual aspects of getting to know someone, because we all know they would be head over heels for the likes of you.