New people who don't know wtf they are doing because we don't have structured training and our written documentation is piss poor and we're overall bad at helping them. Some new college grad botched a multi-million dollar program and come to find out, they weren't getting any meaningful mentoring or guidance.
The thought is we will be better at seeing these sorts of gaps earlier if we're having real conversations, not just the routine PowerPoint presentations sanitized to show all is good.
Could a team train and mentor via virtual interaction only? Sure. Can this particular team? Nope.
People have recognized that species changed over time since the BC era. There are records of such from the Latin/Greek area and the Islamic area and Chinese area. Two dudes didn't magically come up with evolution from scratch at the same time.