Re: ULA has not yet commited to BE-4
And ARJ is officially committed to having the AR1 ready at the same time.
Except the NASA evaluation team that Congress requested visit both of them said ARJ is 18-24 months behind Blue.
That suggests one of those statements is not going to happen.
Time is money for ULA and they need to get Vulcan started so they can start the process of retiring production on both Delta IV and Atlas V and eventually Delta IV Heavy.