Hmm … That doesn’t really answer the question Nobody disagrees that a host of factors are at play with any major breakthroughs However, much like Engels state

Hmm … That doesn’t really answer the question Nobody disagrees that a host of factors are at play with any major breakthroughs However, much like Engels stated when discussing his relationship with Marx, Marx in his view was a genius that didn’t need Engels and could have done it all himself. So there really are individuals that we can point to that did the work and have demonstrated their individual inputs were far and beyond the deciding factor in success or not. If anything the elucidation, of the “trials and tribulations” emphasize the difficulty and exceptional talent required to accomplish it