I was watching a seminar video recently (that had been provided to me by an acquaintance). He was wanting me to see the types of “techniques” that he had been shown (in his prior system).
Most importantly, having a solid understanding of the physical aspects of what your attempting to accomplish is of the utmost importance. Knowing the (uke's) bodies physical limitations is critical as well (and, no, being double jointed doesn't make any difference, LOL).
Your practice should include a response for every manner which a limb could be grabbed. It's fine to state (but not to believe) that if someone grabs you (in whatever manner), that you will just "strike" them with the other (free) hand. But I can assure you, that the ability to do so, is only an assumption (on your part), as well as whether the inferred "strike" can/will be an effective response to the situation as well.