that is a fairly good article on beat detective. there is some essentials that he left out when it comes to metal drum editing. For example, there will ALWAYS be times (especially during big double kick parts or complex ride parts) where the hands and feet wont meet up at all. Just remember hands ALWAYS win. Since the kick drum is usually the quietest drum you can usually just draw the feet in later. BUT that being said, You should always try and do all drums together, especially if you plan on using any room mics in your mix. If you track the drums with the drummer, it may be wise to just have him play the double kick parts he cant pull off by playing the hands with the kicks at half speed (say 1/4 or 8th notes instead 16ths) and draw the feet in later. Also listen closely to your cymbals and rides as the doubled hits show up most with those, usually in a fast ride part i'll quantize the ride hits and drums that dont happen at the same time as the ride, then fix the off the kicks and snares afterwards. I could really go on for days with stuff...
As he said though LISTEN to the drums...and dont ever edit without the click going...beat detective is notorious for saying it will quantize to a certain beat and then it'll be a 16th or 8th off even after you've fixed the trigger time. So make sure your listening closely and fixing any mistakes.
hope we helped ya.