It seems like they don't care about helping that roster either. No callups in months and Harper is probably returning to Raw.
no callups in months? The draft happened mid-July and most talent didn't start getting their time on Smackdown until August. American Alpha, Alexa, Mojo, and Carmella all came up 2 months ago. That's more than enough time to wait until the next callups since calling people up every month would be overkill for the talent attempting to get themselves over.
Smackdown did add Jack Swagger, Rhyno, and Heath recently. They will be adding Curt Hawkins soon, too.
I imagine Corbin and Crews are still held in high regard, but will need more time to develop, especially Crews.
Smackdown should trade Kallisto to the Raw for Bo Dallas, Titus, or Darren Young. Kallisto can compete for the IC and Cruiserweight titles, Dallas/Titus/Young would get more chances on Smackdown to get over rather than on a crowded Raw brand that doesn't have much for them.
NXT talent that is "ready" and can easily leave NXT without hurting the brand include:
Tye Dillinger, The Revival, and Buddy Murphy (prefer him to Blake). All could easily fit on Smackdown, but WWE needs to talent like Corbin, Crews, American Alpha, and the previous callups to move up from the midcard to the main event sooner rather than later to have room at the bottom of the card.
Joe, Roode, Nakamura, Itami, Asuka, and Aries will likely be there for the remainder of the year with Joe being the closest to on his way out.