He and I very often disagreed, disliked one another, talked shit behind each other's backs, fought, argued, and generally did not get along.
But, I do believe he contributed a lot to the training industry, and the firearms community as a whole. The idea that people should be accountable for their training, quantifying & documenting their progress, and defending their opinions based in facts and experiences, were all ideas that he vehemently championed.
In addition the idea that a non-LE, non-military, regular dude has something to contribute to the discussion when the topic is folks of a similar background and their self-defense choices.
He also reached out to me personally at a time when my life was turning itself upside down, which always meant a lot to me and changed my opinion of him as a person for the better.
I'm sorry to see him go, and I will miss our disagreements tremendously.