My co-founder was previously the (only) VP of Engineering (and did a great job), but we mutually parted ways after the Series B. These things happen...
Your earliest press releases are from 2 years ago. How can you have lost that "only" VP of Engineering who as your co-founder was part of the team back then, be recruiting for the position a year ago, and be recruiting for the position now, but this time it is only been for the last 3 months ... well, I suppose you could have just not actively tried to fill the position during the gap, but that at least suggests it's not really that important. And why didn't you mention that?