Chadwick was ahead of his time, Remember he was the one who pushed for Wakandans to have African accents and not British ones, he knew how important T'Challa was to Young kids that he turned down deals that could hurt that image of T'Challa. He was 100% T'Challas point man, and now that he passed look how quickly things fall apart for T'Challa and what they are going to do in the name of honoring Chad. Seems like he was the only one at Marvel who actually cared about T'Challa