...and people of the Tohei lineage here feel that IP/IS methodology (Dan's per se) is compatible with what Tohei taught, then all these data points support a clear relationship between the various methodologies, allowing for differences in flavor that would've been acceptable to Takeda and Ueshiba.
Just fwiw, I'm in a lineage descending directly from Tohei. Very focused on his ki tests, exercises, etc. And I just finished up yet another seminar with Dan. I (and 2 others I spoke with afterwards) saw little that was in conflict with what we do. Just expansion / elucidation / clarification of the concepts. So agreed completely. Your mileage may vary, however.