Sam, it is a good question but the hard part of responding to it is there are no absolutes. If the fish are feeding aggressively, I don't think it matters at all but if they happen to be shy, then I personally would think the one foot of mono isn't long enough and that you should think of perhaps a three foot length.
That said, there are anglers in this sport who use kevlar direct to the lure and it seems to work for them.