Its fine to leave gaps, the latest role is the most important. The .net work doesn't add much to a DS role so there isn't much weight in mentioning it and it shows you spent less than 100% of your focus on DS. If there aren't other candidates then that's fine but there are 10s of candidates that are more or less DS-only on paper.

If candidates could see the other applicant's CVs it would kick off an arms race.