First of all, the SBDII is intended to enter service about 2 years from now...it’s not even completed all of its testing. I guess no aircraft should be built while waiting for a bomb?
http://en.wikipedia.org/wiki/GBU-53/B
http://www.foxnews.com/tech/2015/03/04/new-small-diameter-bomb-doesnt-fit-inside-marines-f-35b/
Out of this note the date when development started and that of the FIRST “flight”.
IOW...the F35 was already finalizing design when the SDBII was just beginning design and it’s first “flight” was after the F35’s were already being delivered.
I think the point is, the F-35 is a joke, an over priced joke.