Someone totally sold me on the idea of batting Casas lead off, it's pretty unconventional, and I see him long-term as more of a 2-4 hitter potentially, but I kind of like it for next year.
There's no real prototypical lead-off hitter on this team.
He's going to be a high OBP guy and will get on base which to me is much more important than speed at the top of the order even with the new rules.
He's going to get a ton more PA's, which will help him continue his development at the MLB level quicker, AND if he hits it's going to pad his stats a little bit and that might help him in ROY voting, which could net the Sox a pick.
Assuming they don't want to lead off with Yoshida, which they have said they are not going to. At least vs. RHP I think they should consider it.