I think the move of Styles had as much to do with the big need at Safety. And, I think C Lewis would be the likely candidate to move to safety.
And as far as Styles seeing CB this year, of course it depends on how the others step up. But, as it stands right now, he would most likely be battling with the two incoming freshmen for the 2nd team corner or nickel to go along with Mickey. If he would have stayed at WR, it is pretty likely he would be in the rotation there. That's what I mean by his greater PT this year would probably be at WR, even if his longer term better future is at CB.
Of course, as you say, injuries could alter the whole scenario.