I'll take a crack at this. The loop of line that goes from luff track around to the luff track allows the block to remain orientated to the front of the mast. The benifit of this set up is the mast is free to rotate. If the block was rivited to the front of the mast or attached to a tang the pull of the hooter (in this case) would under rotate the mast. In puffy conditions the mast would be getting jerked around. Not a good thing. Now remember the pic you were looking at is a Tornado. Those guys look to remove as much weight and windage as possible. Imagine what would happen if the line that runs up to the padeye wasn't there. As you pulled the sail up that looped line would pulled down into the mast. The block would not be able to freely move along that looped line. Another variation of this is to have the haylard go up to a block at the padeye then down to the block on the looped line. The Tornados don't do this because it adds more line and weight at the top of the mast.

But what we're talking about here is hooters and hooters CAN produce greater loads when they are used close to the wind. I don't think I would use the pictured system for your boat. I would go for the Tang rivited on. You might what to install a positive rotation system to control the mast. I'm sure Rick has some ideas about it and if he dosen't respond here email him and ask.

Hope that helps some.
Have Fun
Mike