Orkney1996

I have been reading the guidelines for all 2020 Olympic sports over the last few weeks trying to gain a better understanding of how athletes can qualifying for the Olympics.  When I came to reading the qualification guidelines for the Athletics I became a little confused and was wondering if anybody would be able to answer my query.
 
So I see that athletes can qualify by entry standard and their world rankings as well as athletes by universality place and athletes running only in the relays.  I then looked at the road to Olympic Games 2020 - https://www.worldathletics.org/stats-zone/road-to/7132391?eventId=10229634 - and seen that 91 athletes meet the entry standard time for the Men's Marathon but the entry number is 80.  Would all these athletes be able to compete or would some of them have to be cut?  Also as it stands 31 athletes meet the entry standard time for the Men's 100m.  Lets say 12 athletes obtain a universality spot, would it then be 13 athletes qualifying via the world rankings to reach the enter number of 56 or would it be 25 athletes with the universality spots added on top to take it over the 56 limit?  Would that logic also apply to the other events in Athletics?