NP last year had a slide they stated intended to submit part 1 by end of December. (and this was early December) Then in January he had a slide saying in saying part 1 was complete (or submitted can't remember). In my opinion the FDA already took a soft look at in December/January. They then came back with safety data needed for 700mg and additional items needed (like pediatric info for mono). And it took until March to update those items. JMO based on putting the tea leaves together.