Had to check in on this.
Murphy definitely better than Berian this past year.
Murphy definitely capable of 45.4r, just like any other sub 1:43 runner, despite all the slowpokes who believe goofs like Deano who think that guys who can manage mid 48's are capable of sub 1:43.
Murphy looking like sub 3:30 is in the future, as noted earlier in the thread. If he keeps working he could be a medal threat at both the 800 and 1500 at the Worlds in 2019, never mind Tokyo 2020.