Yes, you still have to feed and level up your Kinsect in addition to the upgrading the staff itself.
The good news for Monster Hunter Generations, however, is that leveling up the Insect Glaive is now more streamlined. For every stat you boosted via feeding, or example, you downgraded another one, requiring the kind of thought and work that was rarely seen since Monster Hunter Tri allowed you to mix and match Bowgun pieces. When the Insect Glaive first came out in Monster Hunter 4, however, upgrading its bug was akin to Monster Hunter rocket science. That's because in addition to upgrading its staff, the Insect Glaive set also requires users to feed its other half - a bug called the Kinsect - in order to reach its true potential. Follow Technobubble poobah Jason Hidalgo’s shenanigans on Twitter Monster Hunter’s only living weapon, the Insect Glaive needs some extra TLC. Technobubble covers games, gadgets, technology and all things geek.