I don't agree that Terrell Suggs is a great comparison here.
It's true that the Ravens list him as a LB, though I've honestly never fully agreed with that. I'm not sure a team like the Ravens truly have a default depth chart. The Justin Smith argument was made (correctly) on the strength of play-by-play data that was generated by the SF beat writers and, quite frankly, us.
With regard to Terrell Suggs, consider the positional breakdown in the player participation logs from the first four Raven games (W1, 3, 4, 5) put together by ProFootballFocus. According to their game logs, Suggs played 151 snaps as a defensive end, 79 snaps as an OLB and five snaps as a defensive back. I don't think there's a clear argument to be made at all that he should be an LB on the basis of his on-field play. The only piece of relevant data is the Baltimore depth chart, which I agree is compelling given the precedent that MFL in particular has set in other cases.
In Kampman's case, I think the split -- assuming Capers actually uses a four man front on nickel packages and the Packers are intent on using the 3-4 (and I think the Raji and Matthews draft picks suggest they are) -- will be much closer to 60-40 LB-DE. It's certainly something we should be able to track during the preseason, however.