Bao wrote:In how many different ways can you throw a straight lead?
In how many ways could you perform a side kick?
You can perform them in any number of ways, but each one of them will be wrong because you are performing them, and not allowing them to happen as a natural result of the physics of the universe.
When you throw a baseball versus throwing a straight lead, or when you kick a soccer ball versus performing a side kick, the ball itself (which is just an extension of your body) has the unique property of taking the path of least time.
This occurs because the ball follows the properties of nature to reach it's goal.
If you do not impose your own concept on the movements, (which includes your physical characteristics) on any part (the path of motion, yourself, or your opponent) then your body would also follow the path of least time, and then you will move second but arrive first. This is giving yourself up to follow the opponent, this is no movement may be uncomfortable and without breaks or starts and stops. It is the celestial teacher who you must be grateful to.
Secondly, if this is your skill, call it tie, stick, then the application is already complete. You have by definition already sought out the weakness and exposed it, it now becomes a trivial matter to push on the weakness, to flip the light switch on or off so to speak, and in most cases you will have ample time to do it at your leisure because your opponent will be at the end of his rope. You could also do it along the way, which is the true meaning of "at the first touch, the true skill is revealed". It isn't a strange thing at all, it is just what you said -- sticking, but not understood well by outsiders. Because you cannot stick without the requisite peng and lu skills, which comes from the real mechanism of Tai Chi, which is often not found in many "tai chi" arts, but replaced with other mechanics. That is why they are so far off, cannot agree, and will never get the real tai chi skill.
Not that there is anything wrong with the other internal arts, but you cannot fit a square peg in a round hole. For the record I also love to practice xingyiquan and have converted many tai chi movements into xingyi-style drills and back-converted xingyi into my form for amusement. But it requires gutting the mechanics and a clear understanding of why and when. You cannot just put an eagle claw muscle grab into tai chi, there is no point to doing this.
SO getting back to what tai chi is, at least what it is supposed to be, the answer on that side is, there is either one way, or no way. The one way is if you are doing it, but the truth is that there is no way, because applications like throwing a straight lead or a side kick never occur in taijiquan. What's the point? If you have tie, you have everything.
Some other people mentioned entering skill, Entering is easy to practice, you can see some old masters showing how to do entering at push hands practice, at a touch their opponents go flying. But they were not in a random position at the touch, they were in the proper position already. That's the external mechanical way of explaining it, good enough to make into a smaller circle.