I haven't seen that quote from GMatt on Carlo - I.E., I haven't seen a quote calling him a full time inside lineman, only in the sense that he's sometimes positioned there, much like Gary who is the same weight sometimes is.
And on Friday, mgoblog continued to report him as a SDE. So you could still be right but it's not obviously the case. Kemp would be by far the smallest tackle on the roster. Absent a solid GMatt quote, I'll just wait to see.