enneagram 1 extroverted thinking ESTj, ENTj enneagram 2 extroverted feeling ESFj, ENFj enneagram 3 extroverted sensing ESFp, ESTp enneagram 4 introverted intuition INFp, INTp enneagram 5 introverted thinking ISTj, INTj enneagram 6 introverted sensing ISFp, ISTp enneagram 7 extroverted intuition ENTp, ENFp enneagram 8 extroverted thinking ESTj, ENTj enneagram 9 introverted feeling INFj, ISFj
I put Te for both type 1 and type 8, because I think Te can be used both altruistically (as in enneagram 1) and selfishly, for the sake of one's personal survival and expansion (as in enneagram 8). I think ExTjs' motivations fluctuate between both.
and looking at the enneagram symbol:
type 6, which I put as Si dom here, would integrate to type 9 and degrade to type 3. Si doms have Se observing, so under stress, they're likely to act out an Se dom's behavior and be competitive, goal oriented and image focused. Type 6's integration to 9 would mean shifting perspective from physical connections (Si) to implied emotional connections (Fi)
Type 3 would degrade to type 9, where they lose motivation and become somewhat apathetic, which is indeed what seems to happen to ESxp's under stress.
type 2 would degrade to the energetically expanding, lustful type 8, which seems to happen with ENFjs or ESFjs under stress. especially enfjs. integrating to type 4 (Ni) would mean that they become more emotionally balanced and real. an ENFj with creative Ni would likely "integrate" much sooner or perhaps more consciously than a ESFj
ENFp as type 7 would degrade to Type 1 (Te) and elevate to type 5 (Ti). ENTps would have the same pattern, except with creative Ti, far more likely to integrate than degrade ?
demonstrative Fi in ISFps would probably mean an easier integration to type 9, compared to ISTps, who would fall into habits more easily