All the other stuff, good.
Upper body attacks are more important. That being said it's stupid to ignore the lower half so far into your training.
But, from the BJJ perspective that is all we are really exposed to.
1. Straight Ankle locks are never straight. This has been a problem with teaching at many pure BJJ academies.
2. There are two toe holds. One is really and ankle lock and the other is really a heel hook.
Omega— A common claim seems to be that leglocks are more dangerous, especially for beginners, due to a smaller margin of error; whereas an armbar has a gradual progression from “it hurts” via “it really hurts” through a few pops all the way to a real injury, leglocks (especially knee submissions) are said to go more rapidly from first pain to real injury, leaving less leeway for error and giving less time to tap. Do you feel that there’s anything to this; that it’s true; entirely untrue; true-ish but overblown?
(I am fully cogniscant of my own leglock ignorance. I tend to tap very early because when I don’t know what the hell is going on, I’d much rather tap right away than twist my knee the wrong way in an incompetent escape attempt. Need to fill in this enormous hole in my game somehow.)
Well, you could always follow my example and learn the difference between "The kneebar is hurting my leg" and "The kneebar has renderd me incapable of locomotion besides the hop on one foot" by trying to gut one out because you are NOT going to tap to your younger brother cartwheeling into said kneebar twelve seconds into submission wrestling class.
I will say that in this particular case I had plenty to feel the pain, think "I should tap...bugger that!", try to spin out, and then collapse face first on the mats as my knee made some really interesting noises.
Personally, I believe it is the very enigmatic nature of the leg lock in BJJ that causes so many people to get hurt by them. After all, by the time you get to blue belt you've been through hundreds, maybe thousands of elbow and shoulder locks, you know when something is escapable and when it's time to make the noise of one hand tapping.
People don't have that level of familiarity with leg locks, so they try to fight out of submissions that are fully sunk in and PRESTO! Six months on the injured reserve list, and one more statistic to be pulled out by black belts explaining that such moves are too dangerous to be trained on a regular basis.
It's my (anecdotal) experience that truly debilitating injuries are more common from leglocks than armlocks even today.
Kneebars and straight ankle locks aren't terribly dangerous when taught properly. Teaching someone a kimura is probably more dangerous. Toe holds and slicers are slightly more dangerous, and heel hooks have the biggest risk when done incorrectly.
Good leg locks require good positional control of your opponent. This is what is not understood by many people, and why they are seen as such risky moves by many BJJ practitioners. You need to have your opponent's hips killed, balance broken, he should not have a good base, etc. (just like upper body subs) When you do all of this, it's not the shitty snatch and grab submissions that some people consider them.
A good leg control position is not awarded points in BJJ competition. Sure, someone could get the sub from that position, but why not take the upper body position points, and hunt for a sub up there?
In SAMBO however, you get points for a pin once, but then don't score for position switches. This means players will tend to use whatever sets them up for the sub. Legs are obviously a valid option here, and can be fairly high percentage when set up correctly.