The only question about the top five quarterbacks in the draft is how long it will take for all of them to be off the board.
You can make a feasible argument that, with trades, all five will go in the top five picks. Unlikely, but you can tell yourself that story. The Atlanta Falcons at No. 4 overall and Cincinnati Bengals at No. 5 should have ample opportunity to move down, with teams looking to move up and land their quarterback of the future.
Unless something weird happens, we're getting five quarterbacks picked in the first round, no matter how long the fifth one lasts.