Hey Hon if your going to submit later this month, you might as well just wait until hubby does his medicals in early October. Personally I think it's just easier, send everything together at once, Less stress and peace of mind.. at least for me, everyone's different.
Shorty way is correct too though, cause you'll have more time on your medical before it exps, but generally Kingston will extend medicals if medicals are close to expiry,you just have to email them, anyway just my thought either way is no wrong way