You're right. Kahlil will be a 1 technique. That is his most natural position and the one that will make us the most dangerous.
Depending on how quickly Kyle Phillips progresses and how much good weight Derek Barnett has put on this off-season, I could see them moving Derek to the 3 technique. Ole Miss did the same thing with Robert Nkemdiche this past season and IMO he's the closest comparison to Derek in terms of body and build.
My hope is by the end of the season, we're running a pass rushing lineup that features Phillips, Barnett, McKenzie, and Maggitt on the field at the same time. That would be our most talented lineup.