Again, I’m going to have to ask you whether you are asking for a 500 million year videotape. You are pseudo-quoting Stephen Gould on the sudden appearance of new species.
Gould’s evaluation of people who misuse his writings is that they are either dishonest or stupid.
Obviously sudden for me doen’t mean the same as sudden for you. But it doesn’t change the fact that there are no fossil examples of simpler organism becoming more complex organisms. All we see since the Cambrian Explosion is either extinction or devolutionary specialization.