Board Thread:New on Ben 10 Wiki/@comment-24700404-20180206094249/@comment-24922135-20180206235552

Omni-Enhanced Heatblast gets a jetpack so he can focus on attacking while flying instead of having to do one or the other.

Also, while we haven't seen him for a while, Shock Rock is still one of Ben's 10. The reason so many episodes don't have him? So they can show off the Omni-Enhancements and still build up to Shock Rock's reveal even if the US messes up the airing order horribly, as they did with season 1.