It's good that you're training with more senior grades, you should see your skill level improve and hopefully as you see them work to bring you on you'll get a sense of how to bring on other less skilled, focused or disciplined people in your club. Something to consider in your interaction with the 10 year old, you say that your sensei has you do kumite with a more senior grade who stands on your feet and hurts you and you're clear about the impact it has on your training. I wonder if the child you were kicking possibly feels the same way about having to train with you each week particularly given you've posted twice now about them having a hard time at your hands. I'm not sure I would have continued with a drill 5 times knowing there was a good chance the child would move the pad away and certainly not if I'd already kicked him in the face once or twice. It's not your job to put him in his place, teach him a lesson or manage his behaviour, that's your sensei's job. We have some fairly strapping kids in our club, 12/13 year olds taller than me and in some cases pretty strong, but they're still kids and I wouldn't dream of sparring with them the way I would a peer. The thing is as an orange belt, you're still a fairly junior grade yourself, even if you are, understandably, more skilled than the child. If you can't work with this him without hurting him perhaps you need to speak to your sensei about developing control or changing partners.