Phil,
You CAN (at least in theory) do most jobs with most systems.
Some, however are better than others for different jobs. I use Dry Fusion a lot but not on blacktop.
I was told by someone at Dry Fusion to use it on black top as well. The problem is that there is so much to remove that it takes a long time and HWE is more effective.
If you are going to use DF stuff then hot Bactoshield seems to break it down better. Then use pads soaked (then wrung out) in plain hot water. To be honest, it's pushing it with that set up. Incidentally, COLD Bactoshield works very well on blood stains.
As for the brush, I do not have a restore brush, I just use a polypropylene scrubbing brush on a rotary machine.