Because he saw what Ashworth was getting from Creighton compared to BYU. They've been in consistent contact since that time back in 2023 after Ashworth came on his trip to BYU before deciding on Creighton.
It's no secret Creighton offered Ashworth a lot more than BYU did. Some on here who claim to know Ashworth still stubbornly insist him going to Creighton had very little to do with NIL. That's a partial truth and they know it. Even somehow suggesting that people who think that somehow bothers him. He took the bigger bag. It's what DI athletes do now and somehow he's trying to insist on some principle other than money was the deciding factor. That's 100% bull cookies. It was the driving factor to him choosing Creighton.
Dallin saw that and felt he played well enough his Sophomore season to get a similar deal. It's why he's in the portal. Players from other schools text and communicate with each all the time. That isn't exactly new.
Creighton has had an in with Hall via Ashworth ever since he joined that program.