Well, the comics make no secret that it was Peter thinking it'd be better for him to be around for Harry's sake, Spectacular follows Weisman's usual dumbass villain shit of "Haha, I'm a master planner, even when I'm lucky, but the narration won't point out how much luck I needed so I can look smarter!"
And while the first times Green Goblin was just lucky to use other people to hide his identity (Chameleon just happening to steal from Oscorp while disguised as Norman on the same day Norman steals from it as Green Goblin, and everything about Harry), by season 2 he was doing it on purpose, by kidnapping Harry so he can be Green Goblin as much as he wants without Spidey being suspicious, hiring Chameleon to pretend to be him while Norman can be Green Goblin so both Norman and Green Goblin can be at the same place at the same time just fine, pinning the blame on Menken to set up a trap on Spidey... He went from doing it on accident to doing it on purpose in very effective ways, Hobgoblin doing the same thing would be just a repeat, without the novelty.
At the very least, in the gang war episode has Kingsley suddenly acting in a more cowardly way, and while that can be understandable considering he was dealing with super-villains, he says later "Bait and switch. Sometimes the classics really are the best", then sees people around him fighting and acts more composed all of the sudden, so yeah, it really sounds like he was using his brother there, though how much he'd use that once he became Hobgoblin, hard to say, but again, using other people to hide his identity as Hobgoblin wouldn't have a novelty anymore, plus it'd be too soon to do the same thing in the next season... Then again, Young Justice's season 3 repeats a lot of shit from season 2, so that wouldn't be surprisingly, unfortunately...