Just out of curiosity, why do you think that?
The practice of Reggie always being on the left and the other WR always being on the right went out the window when Arians arrived. It's been my read of things here that most people liked that change and perhaps, so did Reggie. He lines up all over the place. I hope, and expect that to continue.
Before Arians Reggie lined up on the left the overwhelmingly majority of the time. And even though he went in motion a lot this year and ended up various places he started on the left a lot. I also said later in that post that I'm sure they will all move around some seeing as who they are all of similar size. But just lining up in a basic formation that's where I see them lining up. Of course not many of us know what Hamilton will do just yet. Probably you better than anybody, but it was just my guess