Ra/Q'uo, Predominant Personality Types, Reincarntion

[zenmaster]

it appears to be so strongly indicative of I and N types prevailing

Then you would be surprised to find that you are wrong. There is the wanderer identification and popularization from the online meme and there is the wanderer phenomena itself. These are two different things entirely. Further, understand that the MBTI classification is an indication of imbalance which may be overcome during the seeking process - i.e. become more well-rounded as a personality, just as our shadow may be integrated. I'd say the "activated" wanderer that still seeks and actively processes catalyst will necessarily become more well-rounded as they individuate - perhaps even as early as their 30s if intention is present.