Ok, so there is one hard and fast rule that I adhere to...
SUMMER DOES NOT START IN APRIL!!
The DBR Masses: "But Jason, Avengers 4 is going to be the dominant movie of the summer and it opens on April 26th. Are you really going to exclude Avengers from the summer contest?"
Jason, DBR game master: "No, of course not. But, summer does not start in April."
The DBR Masses: "Well, I'm officially confused."
Jason, DBR game master: "Allow me to explain..."
When the time come to pick our top 5 of summer, Avengers 4 will be an option. But, the boxoffice total will only count ticket sales after April 30th. We will check the boxoffice for Avengers 4 on April 30th and deduct that amount from the final boxoffice tally of Avengers 4. This means that if you choose to pick Avengers 4, you will probably have to subtract something in the range of $250 million from its boxoffice total to see if it make the top 5 movies of Summer. If it only makes $450 million, you could be in real trouble.
-Jason "I'm very excited about this solution to the internal conflict I was facing over what to do with Endgame and its April 26th opening date" Evans