I agree with you the lower blade on the winches have added safety, but most winches I look at raise the wood up high to the top link. My whole point was someone stated he should pull it with his draw bar. Most winches and that grapple and log skidder attachments raise the log using the 3 point hitch, not drawbar. Most people can not justify the cost of a winch but could for a skidder attachment like this.I'm going to agree with your point here, but argue the specifics. I was talking about skidding winches. The grapple you show in the second picture is a grapple, not a winch. I do see your point, though. I've never operated a three point grapple, and I've never researched purchasing one, so I'm not familiar with how they deal with the danger of creating a backwards flipping situation. I would guess that the idea is that as long as the butt of the log is off the ground, you should be good, but I would still think there's a possibility for an accident. Personally, I think a winch is a better, safer, more versatile tool, but I can see where a grapple like that would be pretty slick. No matter what, skidding logs is dangerous business. All we can do is try our best to be safe.
Not sure that a skidding winch offers much backwards flip protection (other than getting butt of log off the ground) because most 3 pth's have no downward pressure.
Like a chain you can only lift and lower with, you can't push down with it.
So if the tractor flips backwards the attachment just hits the ground and the tractor continues to flip (similar to the attachment being pushed up)