Why 3 check points confirmed to decide a treatment point?

Last 2 times I talked about how to select a treatment point in the root treatment using 3 check points which were the pulse, abdomen and the muscle on the shoulder. Why is it necessary to check 3 points? Certainly it seems good enough to check 1 point because if the stimulation to the body is good effect, all parts of the body should manifest good reactions. But actually that is not true.

Previously I relied on the pulse so I was thinking that if the pulse got better, that leaded to a good way. Now in my treatment, I check the pulse, abdomen and the muscle on the shoulder, but it happens that the pulse and abdomen get better but the muscle on the shoulder doesn't get better by light strokes, or the pulse seems better but the abdomen and the shoulder muscle seems tighter on a certain point. 

For example, in the case that Sho (pattern) is Kidney Deficiency,  I confirm which can be a treatment point, KD3, KD7 or KD10. When I gives light strokes on KD3, all 3 check pints don't get better like the pulse becomes fast, the abdomen becomes tight and the muscle on the shoulder becomes tight. KD3 can't be used as a treatment point. When I give light strokes on KD7, the pulse seems better, the abdomen becomes softer and the muscle on the shoulder becomes a little bit tighter.  At this point, KD7 seems usable as a treatment point if I choose only the pulse as a check point, but when KD10 is checked with light strokes, all the 3 check points get much better, or the pulse seems better, the abdomen becomes softer and the muscle on the shoulder becomes much softer, KD10 is a better point to treat. Why does this phenomenon appear?

Even if I think that is better, that is not actually better. When KD7 is checked, the pulse seems better but Kidney position might be not deep enough, the abdomen seems softer but maybe not smooth enough, and the shoulder muscle should be softer. That meas, thinking these check points get better is possibly my misunderstanding. 

Therefore, checking on 3 points can avoid such misunderstanding and has more possibility to lead to a better treatment point than relying on 1 checking point. Of course, the master of Meridian Therapy would not need these processes.