[jeockammece]

Using multiple sources is a popular approach, but what I'm not certain of is where the Dhamma of the Suttas is seen to be deficient enough to warrant going afield. Right View is the foundation of the whole thing, and I do not see Right View any place other than the Dhamma; e.g. samadhi from other sources isn't going to be sammasamadhi.

To the extent that a sutra or other meditational/philosophical source deviates from sammaditthi (Right View), to that extent it will mislead and distract from the goal, and to that extent it should be set aside as irrelevant to practice.

So your saying that one could only obtain right view if they learn it and practice it entirely from the Dharma? Sounds robotic and superficial to just do as you are told without experiential discernment.

The Dharma is designed to show a way of life to which one is likely to obtain personal liberation, first through mental development and ethical conduct and then, through wisdom. The Dharma, for you and I, is the best way to build a foundation for proper conduct but, it is not the only way. To assume that it is such is to construct a limitation. In doing this, you create an other mental state to which one must overcome in personal liberation.