Jorx,
Light live drilling is good but really doesn't help your coordination not as much as so-called dead drilling and coordination is the main issue. Any so-called live drilling is good only AFTER you have decent coordination or control of your own body. If you don't have good coordination then light live drilling doesn't seem to help much. If you suck as a basketball player, that is, you don't move very well, have bad coordination and bad body control then I don't know how playing a few "live" games is going to help you (your coordination that is) if anything it is going all the more expose how bad of a basketball player you are (who will be the very last person picked for any team, assuming you are picked at all).
Like I said alot of people lack of skill and progress can be directly linked to poor coordination. When you have poor coordination you are actually fighting against yourself every time you try to do a move or simply move like your suppose to for you sport/activity. You muscles automatically tense up and cause you movement to be stiff and almost robotic. Everything you do is off. Your movements aren't smooth, you telegraph everything, your reaction is hella slow, you get in your own way, your timing sucks. You're just no good.
Good coordination has a direct and positive effect on every other important quality in Bjj. Timing, reaction, movement, transition, posture, combinations and even learning new technique can all be directly link to coordination.
When I was growing up "uncoordinated" was the word used for scrubs. A scrub is a person who tries their best to be good at a sport or activity but simply falls way short. A scrub is a person with too left feet. They can't seem to do anything right even the most basic of moves.
I am telling if you can easily do the simpliest of moves and movements in Bjj, how are you going to do the more complex and complicated? It is sad that many people in the martial arts can't recognize the common problem for success and progress as well as the common solution in the martial arts.