I am all for dynamic exercises first in the morning. Leg raises, side raises etc. slowly to height. This really does set you up for the day. If I do that, I don't do any more stretch for noon class and for the evening class. But if you are sore from previous workout, that is a different story.
That being said, I think at the right time in a fight, the spin heel or jumpspin heel to the head is an effective fight ender. It is an inside striking zone kick though and not an opening move. But for it, all you have to do is get your hips around to face away from the opponent, a quarter turn. Its a small spin on one foot, lifting at the same time for a spin heel. Its faster on a jump. I'm talking about a snap kick both ways. The wheel, forget it, you can see it coming and is too slow. Also, your flexibility has to be pretty good most of the time. If it takes effort to get up there generally, I wouldn't try it.
That kick is my nemesis right now, as I have to do a jumpback kick on one side through two boards-chest level, then come down jump again immediately and do a jump spin heel with the other foot on a board held with two fingers (speed break)at head level. Since I'm really coming down on one leg, that leg has got to jump some, supporting all the weight while the other is kicking back and going for the target. So I'm saying, its both good to be great at jumping (extra time in the air) and also be flexible.
I had practiced it so much, that I threw that combination in a tournament in reflex and realized it almost too late but stopped it. I just tapped my opponents head. It happened pretty fast. TW