Well to be fair we don't who else came over from 616.
There is a way to look at this-every merged with their UU counterpart. So 616 Peter would have the memories of UU Peter, since the UU cast is younger than the 616 cast.
So now dead folks in 616 like Rich Rider and Dwayne Taylor are probably alive now if they were around in the UU universe.
Heck Miles of 616 could have been dead and that explain's Peter's expression at the end of Spider-Men and the Rio we see is the 616 that didn't lose her son.
Bendis really left plot line that could be used later on.