The whole... "Being early gets you interviews, but not acceptances. It's more fully based on DAT/GPA" is such a wrong way to look at it.
EACH school that is sending out interviews has the pick of the litter.... each school COULD offer interviews to 200 students with high stats from the first two batches and be done, but they don't.
They give some of the VERY finite number of interview spots to people with lower stats.
While an interview does not equate to an acceptance. I feel (as was stated above) the more interviews you receive, the more indicative this is of you receiving an acceptance.
0 interviews = reapply, (unless creighton accepts you without an interview, haha).
1 interview = meh
2 interviews = ok
3 interviews = pretty good
4 interviews = you should be fine
5+ interviews = golden
I know I know, this of course allllll depends on where your interviewing... but you RARELY hear someone say "My friend interviewed at 5 schools and was rejected by all of them"
apply early = better.