Interesting and certainly sad but by no means unusual and maybe not what I'd call a trend. You dont have to go too far back to find years where there have been fatalities in every month from Jan to April.
This latest outbreak was a much better result than what happened last year.
Storms last year were further east in the more populated areas of Dixie Alley. These storms were a bullseye for Tornado Alley. If storms keep forming in this area is hard to see how this year could be even close to as deadly as last year.